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 1552.
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. The cycle typically runs through 20 letters of the alphabet (excluding J, and sometimes other letters) before restarting. 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–V | Roman capitals | Plain shield |
| 1618–1638 | a–v | Italic lowercase | Pointed base |
| 1696–1716 | A–V | Court hand | Complex shield (Britannia period starts 1697) |
| 1756–1776 | A–U | Roman capitals | Old English shield |
| 1796–1816 | a–u | Roman lowercase | Rectangular |
| 1836–1856 | A–U | Roman capitals | Shield with pointed base |
| 1876–1896 | A–U | Roman capitals | Square-cornered shield |
| 1916–1936 | a–u | Roman lowercase | Irregular shapes |
| 1956–1974 | A–S | Italic capitals | Diamond/shield |
| 1975–1999 | A–Z | Roman capitals | Standardized (post-convention) |
| 2000–2025 | a–z | Roman lowercase | Oval |
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 | Old English, various shields |
| 1798–1824 | a–z | Roman lowercase |
| 1824–1849 | A–Z | Roman capitals, square shield |
| 1849–1875 | A–Z | Old English capitals |
| 1875–1900 | a–z | Roman lowercase, square corners |
| 1900–1924 | A–Z | Roman capitals |
| 1924–1950 | A–Z | Roman capitals, plain shield |
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 are the second oldest in Britain, beginning in 1552. The Scottish system uses a thistle as the standard mark (instead of the lion passant) and a castle as the town mark.
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:
| Letter "A" | London | Birmingham | Sheffield |
|---|---|---|---|
| Cycle starting ~1876 | 1876 | 1875 | 1868 |
| Cycle starting ~1900 | 1896 | 1900 | 1893 |
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 at the 1975 convention?
In 1975, the International Convention on Hallmarks standardized some aspects of the British system. After 1975:
- All offices began their date letter cycles on the same year (January 1)
- The "common control mark" (a set of scales) could optionally be added for international recognition
- Sheffield changed its town mark from a crown to a rose
- Date letters continued but became simpler and more uniform across offices
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?
Each assay office maintains its own independent cycle of date letters, typically running through 20 letters excluding J before restarting. 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. A letter A from a cycle starting around 1876 means 1876 in London, 1875 in Birmingham, and 1868 in Sheffield. 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 are the second oldest in Britain, beginning in 1552. The Scottish system uses a thistle as the standard mark and a castle as the town mark.
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 1975 International Convention on Hallmarks standardized aspects of the British system. All offices began their date letter cycles on the same year, January 1, an optional common control mark of scales was introduced, and Sheffield changed its town mark from a crown to a rose. Date letters continued but became simpler and more uniform across offices.