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 the Date Letter System Works
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.
London Date Letters
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 |
Birmingham Date Letters
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 |
Sheffield Date Letters
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).
Edinburgh Date Letters
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 Office-Specific 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.
Reading 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
The 1975 Convention Change
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.