British Silver Date Letters: How to Read Them

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Last updated: August 13, 2026 · By White Metal Resources Editorial

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British silver is easier to date than almost any other national silverware, because the assay offices have stamped a date letter on nearly every hallmarked piece since 1478. That small letter, read alongside the town mark and the sterling standard mark, pins the year of assay to within one year for most pieces.

This page walks through the British four mark system, then explains how the date letter fits inside it. It covers why the letter cycles reset, which town mark belongs to which office, and a repeatable five step method for reading a date letter on a piece in hand.

The British four mark system, in plain terms

A hallmarked British sterling silver piece carries four small stamps, usually punched close together in a row. Each stamp answers one question about the piece.

The sponsor's or maker's mark is one to three letters inside a small shield or lozenge. It identifies the shop or the silversmith registered with the assay office. British and Irish law calls it a sponsor's mark today, because it need not be the person who physically worked the piece.

The standard mark states the fineness of the metal. A lion passant, a walking lion in profile, denotes sterling silver at .925 fineness and has done so since a 1544 statute. A figure of Britannia denotes Britannia silver at .958 fineness, a higher standard that was obligatory in Britain between 1697 and 1720 and optional since.

The assay office town mark identifies where the piece was tested. A leopard's head is London. An anchor is Birmingham. A Yorkshire rose is Sheffield since 1975. A three towered castle is Edinburgh. Each is covered in its own section below.

The date letter records the year of assay. It is a single letter inside a specific shield outline and in a specific typeface. Letter, typeface, and shield read together pin the year. The date letter has been optional on new British silver since the 1999 hallmarking reform, but it remains present on almost every antique British piece.

A short history of the date letter

The date letter system began in England in 1478, when the Assay Office was set up inside Goldsmiths' Hall in London. The letter was originally meant to identify the Assay Master, an official sworn in each May. The letter advanced to the next in the alphabet at every swearing in, regardless of whether the same person held the post.

That yearly rotation turned the letter into a de facto date stamp. By the end of the fifteenth century, collectors and courts already read the letter as a year mark on a piece of London silver. The other English assay offices adopted the same practice as they were founded, each running its own separate alphabet on its own timing.

The Hallmarking Act 1973 brought Britain into the Vienna Convention, added platinum to the compulsory hallmark, and finally aligned the four remaining assay offices on a single date letter sequence. Before 1973 a lowercase italic letter meant one year at London, a different year at Birmingham, and a different year again at Sheffield.

The 1999 reforms made the date letter optional on new British hallmarks. Palladium was brought into the compulsory system in January 2010 as the fourth precious metal covered. The letter has stayed optional for new work since 1999, but any hallmarked British piece before that date carries a date letter that can be read.

The four active British assay offices and their town marks

Four assay offices are active in Britain today: London, Birmingham, Sheffield, and Edinburgh. Each stamps its own town mark next to the standard mark, so a British silver piece can be traced to the office of assay from the town mark alone.

London uses a leopard's head. The mark was ordered by King Edward I in 1300 as the sterling standard mark of the realm and has been in continuous use at London ever since. The London Assay Office is run by the Worshipful Company of Goldsmiths, based at Goldsmiths' Hall in the City of London.

Birmingham uses an anchor. The office was set up in 1773 by act of Parliament after Matthew Boulton and a group of Birmingham makers lobbied for a local hallmarking office. Birmingham Assay Office states on its own site that it has been in operation for over 250 years and has struck the anchor mark since 1773.

Sheffield uses a Yorkshire rose since 1975. From 1773, when the Sheffield office was founded alongside Birmingham, until 1974 the Sheffield town mark for silver was a crown. The crown was replaced by the Tudor rose in the 1975 reform because the crown had also become the standard mark for gold under the new hallmarking system.

Edinburgh uses a three towered castle. The Edinburgh office traces to 1681, when the Incorporation of Goldsmiths of Edinburgh formalised assay under the town's coat of arms. The Edinburgh mark is often described as a castle with three towers, one of the simplest and most distinctive town marks on any British silver piece.

Closed British assay offices and their marks

Older British silver may carry a town mark from an office that no longer strikes hallmarks. Six closed English and Scottish offices show up regularly on estate silver in the American market.

Chester used a shield with three wheatsheaves and a sword, and closed on 24 August 1962. Newcastle used a shield with three castles and closed in 1884. Exeter used a three towered castle and closed in 1883. Norwich, one of the oldest offices, closed in 1702. York used a mark based on the city coat of arms and closed around 1857. Glasgow used a fish, tree, bell, and bird, and closed on 31 March 1964.

Dublin ran under the United Kingdom hallmarking system from 1801 to 1922 and used a crowned figure of Hibernia as its standard mark. Irish silver from that period carries the Hibernia figure alongside the Dublin assay office mark and a date letter run by the Dublin office.

Why date letter cycles reset (and how long a cycle runs)

A date letter cycle is a run of consecutive letters used once by an office, then reset. When a cycle ends, the office starts a new one in a new typeface, a new letter case, and often a new shield outline. The reset is what lets a small alphabet cover several centuries of assay years without ambiguity.

English cycles typically ran twenty letters at London, from A to U with the letter J omitted. Other offices used cycles of twenty to twenty five letters, with a few later cycles running the full A to Z alphabet in some periods. The exact length varied by office and by era. Any specialist reference chart lists each cycle by start year, end year, and typeface.

Three inputs pin the year on a date letter. The letter itself narrows to one of twenty or so options. The typeface (roman capital, lowercase italic, black letter, and so on) narrows to the cycle that used that font at that office. The shield outline around the letter (square, cut corner, pointed base, oval, and so on) confirms the cycle when two cycles at the same office reused the same typeface.

The Goldsmiths' Company publishes a public reference to date letters on the London Assay Office website and in the standard printed guides. Any hallmarked British silver piece can be dated by cross referencing the office, the letter, the typeface, and the shield against those reference charts.

A five step method for reading a British date letter

The method below turns the office by office rules into one repeatable sequence. Follow the five steps on every piece and no British hallmark from the four active offices will get read out of order.

1. Locate all four marks and photograph them in raking light. Marks sit on the back of a spoon or fork, under the foot of a bowl or tea pot, and inside the lid rim of a hinged box. Angle a phone light across the surface so every punch stands out from the metal.
2. Read the standard mark to confirm the metal. A lion passant means sterling silver at .925. A figure of Britannia means Britannia silver at .958. If neither is present, the piece is not British hallmarked silver at all, and the date letter method does not apply.
3. Read the town mark to identify the assay office. A leopard's head is London. An anchor is Birmingham. A Yorkshire rose is Sheffield (after 1975) or a crown (before 1975). A three towered castle is Edinburgh. Closed office marks (Chester wheatsheaves, Newcastle three castles) apply to older pieces.
4. Read the date letter shape, case, and shield. Note whether the letter is a roman capital, a lowercase roman, a lowercase italic, a black letter, or another typeface. Note the shield outline around the letter (square, cut corner, pointed base, oval, or shaped).
5. Cross reference against a published chart for the office. Look up the office name, then the typeface and shield, then the letter itself. The chart returns a single assay year (or a two year window straddling the May swearing in date). The Goldsmiths' Company reference is the primary source for London.

A step 2 failure (no lion, no Britannia) means the piece is not sterling standard British silver and the date letter method does not apply. A step 3 failure (no recognisable town mark) means the piece was either assayed at a closed office or is not British at all. Cross check against a specialist reference before you price the piece as British silver.

British assay office town marks at a glance

The table rolls up the four active offices and the six most common closed offices. The dates and mark descriptions are load bearing for a reader in hand, because the town mark alone answers where the piece was assayed.

Sources: Wikipedia Hallmark (leopard's head 1300, Assay Office 1478 at Goldsmiths' Hall, lion passant 1544, Hallmarking Act 1973, 1999 date letter reform, LRO 8 February 2013, offshore marking from Mumbai July 2016, closed offices Chester Newcastle Exeter Glasgow Norwich York); Wikipedia Assay office (four remaining UK assay offices London Birmingham Sheffield Edinburgh, closed office dates); Birmingham Assay Office live at theassayoffice.co.uk (established 1773, anchor mark, 250 years of heritage). Checked August 2026.

An offshore hallmark note applies to modern pieces. Under the Legislative Reform Order that came into force on 8 February 2013, UK assay offices gained the legal right to strike hallmarks outside UK territory. Birmingham Assay Office has struck marks in Mumbai, India since July 2016. Any offshore struck British hallmark carries an added distinguishing mark, so the town mark alone no longer proves in country assay on newer work.

A worked example on a hallmarked sterling spoon

Reading a date letter is a lookup exercise once the office is identified. The example below runs the five step method on one hypothetical serving spoon and turns the result into an illustrative melt value at a stated silver spot price.

The same five step method reads a Birmingham anchor, a Sheffield rose, or an Edinburgh castle mark. The melt math is identical for any British sterling piece, because sterling standard is fixed at .925 across every British assay office since the 1544 statute added the lion passant as the sterling mark.

Common pitfalls when reading a date letter

Six patterns cover almost every mistake a general reader makes on a British date letter. Each of the six is easy to catch once the pattern is named.

First, mixing offices. A lowercase italic "a" means one year at London, another year at Birmingham, and a third year at Sheffield until the 1973 alignment. Always identify the town mark before you look up the letter.

Second, missing the shield outline. Two cycles at the same office often reused the same typeface across a hundred year gap. The shield outline (square, cut corner, pointed, or shaped) is what separates them. Reading letter and typeface alone leaves a one hundred year ambiguity.

Third, confusing the sponsor's mark with the date letter. A sponsor's mark is one to three letters inside a small shield. A date letter is a single letter inside a specific outline. On a worn piece the two can blur together at a glance.

Fourth, treating a lion passant as the date mark. The lion is the sterling standard mark. It has nothing to do with the year. Always read the four marks in order (sponsor, standard, town, date) before you draw any conclusion about the year.

Fifth, expecting a date letter on modern British silver. The letter has been optional on new work since 1999. A modern British sterling piece may carry the sponsor's mark, the town mark, and the numeric fineness (925) with no date letter at all.

Sixth, expecting the town mark to prove in country assay on modern pieces. Since 8 February 2013, UK assay offices can strike hallmarks offshore, and Birmingham marks have been struck in Mumbai since July 2016. Modern British hallmarked pieces carry an added mark that flags offshore assay.

Limits and caveats to keep in mind

A date letter records the year of assay, not the year of manufacture. A working silversmith might submit a piece months after it left the workshop, and the assay year straddles the May swearing in date of the Assay Master under the historic system. Assume a plus or minus one year window unless a specialist confirms otherwise.

The date letter method assumes the marks on the piece are genuine and unaltered. Marks can be recut, transposed from a smaller broken piece, or faked outright on a new casting. A dealer's misgiving about the marks is a stronger signal than the marks themselves on a piece with an oddly clean back or an out of place stamp.

Regional and workshop practice varied inside every office and every era. A Chester lowercase italic "a" of one cycle is not always visually identical to the London lowercase italic "a" of the same cycle year, even after the 1973 alignment. Specialist references beat this page for any single piece a reader plans to buy or sell for real money.

Collector premium on named British silversmiths (Paul de Lamerie, Hester Bateman, Paul Storr, and others) can sit far above melt. That premium is qualitative and depends on public auction sales for the exact maker, form, date, and condition. This page does not quote dollar premiums on identified makers, because the premium is only knowable from completed auction records.

Melt figures on the page use example silver spot prices of 20, 30, and 40 dollars per troy ounce. Spot moves continuously during market hours. No dollar figure quoted here is a forecast, a promise, or a live market quote. Every melt number is a computation from a stated spot price and a stated weight.

Silver held for retirement follows a separate fineness rule. The Internal Revenue Code sets the fineness minimum for silver held in a self directed IRA at .999, referenced to the delivery standard of a regulated futures contract. British sterling at .925 sits below that line, so hallmarked British silver cannot go inside a self directed IRA. That topic is covered in our silver IRA fineness explainer.

British silver date letter questions, answered

What is a British silver date letter?

A British silver date letter is a small alphabetical stamp punched by an assay office to record the year the piece was tested. It sits alongside three other stamps: the sponsor's mark, the sterling or Britannia standard mark, and the assay office town mark. The system started in 1478 at Goldsmiths' Hall in London.

How do I read a British date letter?

Read four things in order. First, the town mark (leopard's head for London, anchor for Birmingham, Yorkshire rose for Sheffield since 1975, castle for Edinburgh). Second, the letter itself. Third, the letter typeface (roman capital, lowercase italic, black letter, and so on). Fourth, the shield outline around the letter. Cross reference all four against a published chart for the office.

What are the four British assay office marks?

The four active office town marks on silver are set by office. London uses a leopard's head, in place since 1300 under Edward I. Birmingham uses an anchor, since the office was established in 1773. Sheffield uses a Yorkshire rose since 1975, replacing an older crown mark used from 1773. Edinburgh uses a three towered castle, under the Incorporation of Goldsmiths of Edinburgh from 1681.

How long is a British date letter cycle?

English date letter cycles typically ran twenty letters at London, from A to U with J omitted. Other offices used cycles of twenty to twenty five letters. Each cycle ended with a reset in a new typeface and often a new shield outline, so the same letter can mean two or three different years at the same office across the centuries.

Are British date letters still stamped today?

The date letter has been optional on new British silver since the 1999 hallmarking reform. Many British makers still request one for tradition, but a modern British sterling piece can carry the sponsor's mark, the town mark, and the numeric fineness of 925 with no date letter at all. Every antique British piece from 1478 to 1999 carries one.

What is the lion passant on British silver?

The lion passant is a walking lion in profile stamped on British sterling silver to certify the .925 fineness of the metal. It has served as the sterling standard mark since a 1544 statute. It is not the date letter and not the town mark. The lion answers what the metal is, not when or where it was assayed.

Can a date letter alone date a British silver piece?

Not on its own. A lowercase italic "a" means one year at London, another year at Birmingham, and another at Sheffield before the four offices aligned in 1973. Always read the town mark first to identify the office, then use the office specific chart to translate the letter, typeface, and shield to a year.

Where is the primary reference chart for British date letters?

The Worshipful Company of Goldsmiths publishes the primary London date letter reference on the London Assay Office and Goldsmiths' Company websites. Standard printed guides such as Bradbury's Book of Hallmarks and Jackson's English Goldsmiths and Their Marks cover all four active offices and the closed offices. Any specialist reference is enough to date a hallmarked piece by cross reference.

Sources

1. Wikipedia, Hallmark (leopard's head introduced by Edward I in 1300 as the sterling standard mark, Assay Office established at Goldsmiths' Hall in 1478 with the date letter system, lion passant added in 1544, Britannia standard obligatory 1697 to 1720, Hallmarking Act 1973 with Vienna Convention membership and platinum added, all four offices aligned on one date letter sequence, 1999 reform making the date letter optional, LRO effective 8 February 2013 allowing offshore hallmarking, Birmingham Assay Office striking marks in Mumbai India since July 2016, closed offices Chester Newcastle Exeter Glasgow Norwich York). Checked August 2026.
2. Wikipedia, Assay office (four remaining UK assay offices London Birmingham Sheffield Edinburgh, first UK assay office at Goldsmiths' Hall founded around 1300, ten historical UK assay offices, closed office dates Chester 1962 Dublin 1922 as part of UK system Exeter 1883 Glasgow 1964 Newcastle 1884 Norwich 1702 York circa 1857). Checked August 2026.
3. Wikipedia, Silver hallmarks (British four mark system including sponsor's mark plus standard mark plus town mark plus date letter, LRO of 8 February 2013 changing sponsor mark requirements to allow logos, Sheffield sub office in Malpensa Italy, London and Edinburgh Assay Offices as the only two exclusively striking hallmarks in the UK). Checked August 2026.
4. Wikipedia, Britannia silver (higher British silver standard at .958 fineness, obligatory 1697 to 1720 as an anti clipping measure to prevent melting of sterling coinage, optional standard from 1720 onward, marked with a figure of Britannia in place of the lion passant). Checked August 2026.
5. Wikipedia, Sterling silver (1275 statute of Edward I on sterling silver coinage, 1300 statute requiring assay by guardians of the craft with a leopard's head mark, lion passant added 1544, Britannia standard obligatory 1697 to 1720, Colonial American silversmiths adhered to the London Goldsmiths standard). Checked August 2026.
6. Birmingham Assay Office official site (established 1773, 250+ years of heritage, iconic anchor mark, four precious metals covered under UK legal hallmarking including gold silver platinum palladium). Checked August 2026.
7. The Goldsmiths' Company (Worshipful Company of Goldsmiths, runs the London Assay Office at Goldsmiths' Hall in the City of London, publishes the primary reference for London date letters and the four mark British hallmark system). Checked August 2026.
8. Cornell Legal Information Institute, 26 U.S.C. section 408 (silver fineness rule for IRA metals at .999 minimum, referenced to the delivery standard of a regulated futures contract, applicable to any silver held inside a self directed IRA). Checked August 2026.