TL;DR Date letters are the most useful element of British hallmarking, pinpointing the exact year a piece was assayed. Each office runs its own independent cycle, and a single letter combined with its typeface, case, and shield shape identifies the year. London's sequence began in 1478 and Edinburgh's in 1681.
Date letters are the single most useful element of the British hallmarking system for collectors and researchers. A single letter — combined with its typeface, case, and surrounding shield shape — pinpoints the exact year a piece of silver was assayed. No other marking system in the world offers this level of chronological precision, stretching back over 500 years.
How does the date letter system work?
Each British assay office maintains its own independent cycle of date letters. Cycle length varied by office: before 1975 London used 20 letters, Birmingham 25 or 26, and Sheffield 25 from 1868. Since 1975 every office has shared one 25-letter cycle. Each new cycle uses a different combination of:
- Letter case — uppercase or lowercase
- Typeface — Roman, italic, Gothic (Old English), script
- Shield shape — the outline surrounding the letter changes with each cycle
This three-variable system means that even though the same letter appears every 20–26 years, the combination of case + typeface + shield shape is unique to a specific year at a specific office.
What are London's date letter cycles?
London 's sequence is the longest and most studied, beginning in 1478. Key cycles:
| Cycle | Letters | Style | Shield |
|---|---|---|---|
| 1478–1498 | A–V | Lombardic capitals | Various |
| 1558–1578 | a–u | Old English (gothic) lowercase | Plain shield |
| 1618–1638 | a–v | Italic lowercase | Pointed base |
| 1697–1716 | a–u | Court hand lowercase | Complex shield (Britannia period starts 1697) |
| 1756–1776 | A–U | Old English (gothic) capitals | Shield |
| 1796–1816 | A–U | Roman capitals | Rectangular |
| 1836–1856 | A–U | Old English (gothic) capitals | Shield with pointed base |
| 1876–1896 | A–U | Roman capitals | Square-cornered shield |
| 1916–1936 | a–u | Old English (gothic) lowercase | Irregular shapes |
| 1956–1974 | a–t | Italic lowercase | Square, cut corners |
| 1975–1999 | A–Z | Script capitals | Shared by all UK offices |
| 2000–2024 | a–z | Lowercase | Shared by all UK offices |
| 2025– | A– | Capitals | Shared by all UK offices |
What are Birmingham's date letter cycles?
Birmingham 's cycle started when the office opened in 1773 and follows its own independent sequence:
| Cycle | Letters | Style |
|---|---|---|
| 1773–1798 | A–Z | Roman capitals |
| 1798–1824 | a–z | Roman lowercase |
| 1824–1849 | A–Z | Old English (gothic) capitals |
| 1849–1875 | A–Z | Roman capitals |
| 1875–1900 | a–z | Old English (gothic) lowercase, round punch (cut-corner from 1882) |
| 1900–1925 | a–z | Roman lowercase |
| 1925–1950 | A–Z | Roman capitals |
| 1950–1974 | A–Z | Old English (gothic) capitals |
| 1975–1999 | A–Z | Script capitals, shared by all UK offices |
| 2000–2024 | a–z | Lowercase, shared by all UK offices |
| 2025– | A– | Capitals, shared by all UK offices |
What are Sheffield's date letter cycles?
Sheffield began hallmarking in 1773 (same year as Birmingham) with its own independent sequence. Sheffield is notable for using the crown as its town mark until 1975, when it switched to a rose (the crown having been reassigned as the common mark for gold).
What are Edinburgh's date letter cycles?
Edinburgh 's date letters began in 1681, the year the goldsmiths appointed a separate assay master. The town mark is a castle. From 1759 the standard mark was a thistle rather than the lion passant; since 1975 it has been a lion rampant.
Why do office-specific date charts matter?
A critical point that catches many beginners: the same letter means different years at different offices . For example:
| First letter of cycle | London | Birmingham | Sheffield |
|---|---|---|---|
| Cycle starting ~1870s | 1876 (A) | 1875 (a) | 1868 (A) |
| Cycle starting ~1900 | 1896 (a) | 1900 (a) | 1893 (a) |
You must first identify the assay office (from the town mark), then consult that specific office's date chart. Using the wrong office's chart will give you the wrong date.
How do you read difficult date letters?
On antique pieces, date letters can be challenging to read due to:
- Wear from polishing — Centuries of cleaning can thin the hallmark impression
- Poor original striking — If the punch was applied at a slight angle or with insufficient force
- Damage or repair — Re-soldering near hallmarks can distort them
- Small size — Hallmarks on small objects (thimbles, nutmeg graters, small spoons) are tiny
Tips for reading difficult marks:
- Use a 10x jeweler's loupe with good directional lighting
- Angle the light across the surface to create shadows that reveal the impression
- Focus on the shield shape first — it is often more legible than the letter itself
- Use the Silver Marks app to match partial marks against its database of known combinations
What changed in 1975?
The Hallmarking Act 1973 came fully into force on 1 January 1975 and standardized the British system. After 1975:
- All offices began using one shared date letter, changed each 1 January
- From 1976, when the UK joined the International Convention on Hallmarks, offices could add the optional "common control mark" (a pair of scales) for recognition in other member countries
- Sheffield changed its town mark from a crown to a rose
- Since 1999 the date letter has been a voluntary mark
For collectors of antique silver, this change is mostly academic — the interesting date letters are all pre-1975, when each office maintained its unique character.
Frequently Asked Questions
How does the British date letter system work?
Before 1975 each assay office ran its own cycle of date letters: 20 letters at London, 25 or 26 at Birmingham, and 25 at Sheffield from 1868. Since 1975 all offices have shared one 25-letter cycle. Every new cycle uses a different combination of letter case, typeface, and shield shape. This three-variable system means the same letter recurs every 20 to 26 years but the full combination is unique to one year.
Why does the same date letter mean different years at different offices?
Each office runs an independent cycle, so a given letter recurs at different times. The first letter of the cycle that began in the 1870s is a capital A for 1876 in London and 1868 in Sheffield, but a lowercase a for 1875 in Birmingham. You must identify the assay office from the town mark first, then consult that specific office's date chart for the year.
When did London and Edinburgh date letters begin?
London's sequence is the longest and most studied, beginning in 1478, with cycles running through letter ranges in changing styles like Lombardic capitals, Roman, italic, and court hand. Edinburgh's date letters began in 1681, when a separate assay master took over marking from the deacon of the goldsmiths. Edinburgh's town mark is a castle; its standard mark was a thistle from 1759 and has been a lion rampant since 1975.
How do I read a worn or difficult date letter?
Date letters can be hard to read due to polishing wear, poor original striking, repair damage, or small object size. Use a 10x jeweler's loupe with directional lighting angled across the surface to cast shadows that reveal the impression. Focus on the shield shape first, since it is often more legible than the letter itself.
What changed about date letters after 1975?
The Hallmarking Act 1973, fully in force from 1 January 1975, standardized the British system. All offices began using one shared date letter that changes each 1 January, and Sheffield changed its town mark from a crown to a rose. The UK joined the International Convention on Hallmarks in 1976, which let offices add the optional common control mark, a pair of scales. Since 1999 the date letter has been a voluntary mark.
