Use our free UK Hallmark Date Letter Finder to help identify the possible year of a British silver, gold, platinum or jewellery hallmark. Select the assay office and the date letter stamped on your item to see matching dates from the Victorian period through to the present day.
British date letters form an important part of the hallmarking system and can help narrow down when an item was assayed. However, older date letters repeat in different cycles, so the letter alone is not always enough to establish an exact year.
For pre-1975 hallmarks, details such as the assay office, upper or lower case lettering, typeface and the shape of the surrounding shield or cartouche can all help distinguish one date cycle from another.
The finder currently covers the four UK assay offices still operating today: London, Birmingham, Sheffield and Edinburgh. Results for older marks should be treated as possible dates and compared with the complete hallmark on the item.
If you are unsure which assay office mark you have, our UK Jewellery Hallmark Reference Guide explains the main assay-office symbols, precious-metal fineness marks and other common British hallmark components.
Find a UK Hallmark Date Letter
Choose the assay office and the single date letter stamped on your item. The finder will show possible hallmark dates from the Victorian period to the present, with an optional period filter to narrow repeated letters.
How to identify the assay office
The assay-office mark should be identified before using the date letter. These are the four UK offices still operating today:
About UK date letters
Date letters were introduced to record when precious-metal articles were assayed. Before 1975 the four offices followed different cycles and changed their punches at different points in the year. From 1975 the surviving UK assay offices adopted the same annual date-letter system. Since 1999 the date letter has been optional, so a legitimate modern UK hallmark may not include one.
What this finder can and cannot do
- It can narrow a visible date letter to likely or possible hallmark dates.
- For 1975 onward, the shared UK date-letter cycle makes the result much more straightforward.
- For older pieces, the tool deliberately shows possible matches rather than claiming certainty from the letter alone.
- It does not authenticate an item, identify a sponsor/maker, or prove precious-metal fineness.
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Reference note
This research tool is intended as a practical starting point. For difficult or valuable pieces, compare the complete hallmark with published assay-office references or seek specialist confirmation. Official references: London Assay Office, Birmingham Assay Office, Sheffield Assay Office and Edinburgh Assay Office. Historical database scope on this page: 1837–2026.
How to Use Your Hallmark Date Result
The date shown by the finder should be treated as part of the identification process rather than proof of an item’s exact age on its own. Start by checking that you have correctly identified the assay-office mark, then compare the date letter with the letter style, upper or lower case form and the shape of the surrounding punch or shield.
This is especially important for older silver and jewellery because the same letter was reused in later date cycles. A Victorian letter A, for example, may look very different from an A used many decades later.
How to Identify the UK Assay Office
The assay-office mark tells you where an item was tested and hallmarked. The four UK assay offices operating today are London, Birmingham, Sheffield and Edinburgh.
Sheffield is particularly useful to recognise because its historic silver mark changed from the Crown to the Rose. The Crown was used on Sheffield silver from 1773 until 1973, after which the Rose became the assay-office mark for both silver and gold.
Why Can the Same Date Letter Show Several Years?
Date letters were used in repeating alphabet cycles. Once one alphabet was completed, a new series began using a different typeface, letter case or shield shape. This allowed the same letter to be reused without representing the same year.
Before 1975, the individual assay offices used their own date-letter sequences. Because of this, identifying only the letter without first identifying the assay office can produce the wrong date.
Modern UK Hallmark Date Letters
Since 1975 the four current UK assay offices have used the same annual date-letter sequence, with the letter changing on 1 January each year. This makes modern date letters much easier to interpret than many earlier marks.
The date letter became optional in 1999. A genuine modern UK hallmark may therefore contain the compulsory hallmark components without displaying a date letter.
The current alphabet cycle restarted with A in 2025, followed by B in 2026, C in 2027 and D in 2028.
What Does a Full UK Hallmark Tell You?
A UK hallmark can provide several different pieces of information about an item. Understanding the complete group of marks is often much more useful than looking at the date letter alone.
- Sponsor’s mark: identifies the person or business that submitted the item for hallmarking.
- Fineness mark: indicates the precious-metal purity in parts per thousand, such as 925 for sterling silver or 750 for 18ct gold.
- Assay-office mark: identifies the UK assay office where the article was tested and marked.
- Date letter: indicates the hallmarking year where one has been applied. This is optional on modern hallmarks.
Does the Hallmark Date Mean the Item Was Made That Year?
Not necessarily. The date letter records the hallmarking or assay year. In many cases this will be close to the date the object was manufactured, but it should not automatically be treated as the precise manufacturing date.
Older items may also have been submitted for hallmarking after manufacture, altered at a later date or assembled using components made at different times. The complete object, construction and other marks should therefore be considered alongside the hallmark.
Can a Hallmark Identify the Maker?
The sponsor’s mark can help identify the person or business that registered the mark and submitted the article for hallmarking. This is not always the same person or company that physically manufactured the item.
Maker and sponsor research can therefore require additional reference material, particularly for older silver and jewellery.
Frequently Asked Questions
Why does my letter not appear for the period I selected?
The selected letter may belong to another date cycle, or the assay office may have been identified incorrectly. Try selecting All dates and compare the possible results with the shape and style of the actual hallmark.
Why is there no date letter on my jewellery?
This is not automatically a problem. The UK date letter has been a voluntary element of the hallmark since 1999, so modern hallmarked jewellery may not include one.
Does 925 always mean British sterling silver?
925 indicates a fineness of 925 parts silver per thousand, but the number by itself does not prove that an item has a complete UK hallmark. Check for the other hallmark components, including the assay-office mark.
Can this tool authenticate an antique?
No. The finder is intended as a research aid. It can help narrow a visible UK date letter to possible years, but authentication requires consideration of the complete hallmark, construction, materials, wear and provenance.
What should I do if the hallmark is badly worn?
Photograph the mark in strong side lighting and try viewing it from several angles. Even a partial assay-office symbol, shield outline or distinctive letter shape may help narrow the possibilities.
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