Pocket Watch Hallmarks: How to Read and Date British Watch Cases

The marks inside a British pocket watch case, what each one means, and date letter tables for the three offices that marked most watch cases, 1824 to 1955.

The four marks in a British watch case

Open the back cover of an English gold or silver pocket watch and you should find a row of small punched marks. A complete British hallmark always has four of them, and each answers one question.

Where to look on the case

• Inside the back cover: the full set of four, struck on the main part of the case.
• The bezel, lid, inner dome and bow: each separately made gold or silver part was tested too, so these often carry smaller part marks.

The sponsor's mark is the one people most want to look up, and it is not a maker's signature: it shows who sent the case to be marked. It has its own page, pocket watch case makers marks.

Sources: David Boettcher, British hallmarks on watch cases; David Boettcher, marks in watch cases.

Gold and silver standard marks: 9ct to 22ct and sterling

The crown means 18ct or 22ct

Only the two high gold standards carry a crown: 18ct from 1798 and 22ct from 1844. The lower standards introduced in 1854 show the carat beside its decimal, with no crown.

So a crown and 18 is 18ct gold, while 9 and ·375 is 9ct gold.

1932: goodbye 15ct and 12ct, hello 14ct

In 1932 the 15ct and 12ct standards were replaced by 14ct, marked 14 and ·585. A 15ct or 12ct case is therefore earlier than 1932, and a 14ct British case is 1932 or later.

In use22ct under the lion passant; rare composite 'Foreign' marks

For gold marks on jewellery in general, see gold hallmarks explained. If there is no standard mark at all, the case may be gold filled or plated: how to tell if a watch is solid gold.

Source: David Boettcher, British hallmarks on watch cases.

Assay office marks: Chester, Birmingham, London and the rest

The town mark tells you where the case was tested, not where it was made. Since 1854 a casemaker could send work to any office he chose, so the mark follows trade routes.

Why so many cases say Chester

Liverpool, a major centre of English watchmaking, had no assay office of its own, so its casemakers sent their work to Chester. That makes the wheatsheaves and sword one of the three town marks most often seen in English watches, with the anchor and the leopard's head.

Coventry makers often used Chester or London rather than nearby Birmingham. Chester's office closed on 24 August 1962.

Birmingham: the anchor

Birmingham was home to large casemakers. The Dennison Watch Case Company was founded there in 1874 to case movements imported from the Waltham Watch Company of America, which is why American movements turn up in Birmingham-marked cases.

Sources: David Boettcher, British hallmarks on watch cases; silvermakersmarks.co.uk, Chester.

Pocket watch date letters: Chester, Birmingham and London tables

Each office ran its own alphabet, and every letter comes round again every 20 to 26 years. Fix the office from the town mark first, then match both the letter and its style: at Chester a plain Roman capital A is 1884, a script A is 1901.

• Every letter spans two calendar years. The year shown is when the letter began: 1884 means the assay year 1884 to 1885.
• Changeover days: London on 29 May; Birmingham in July; Chester in July, moved to 5 August from 1839 and to 1 July from 1889.
• Ignore the shield shape. Offices often used different surrounds on gold, on small work and on watch cases, so trust the letter and its style.

Sources: silvermakersmarks.co.uk date letter tables, checked year by year; Sir Charles Jackson, English Goldsmiths and Their Marks (1921), for the years it covers: London to 1919, Chester to 1921, Birmingham to 1924. Changeover dates: silvermakersmarks.co.uk.

Dating a watch without hallmarks, from its movement, serial and style, is covered in how to date a vintage gold watch.

Import marks on Swiss and American pocket watches

Most foreign watches came into Britain before 1907 without British hallmarks, carrying only their own country's marks or the casemaker's stamps. The law then changed in three steps.

1. About 1874 to 1887

   Some Swiss gold and silver cases were marked at British offices with ordinary British hallmarks, until English watchmakers objected.

2. From 1 January 1888

   The Merchandise Marks Act 1887 required a composite mark with the word "Foreign" on any imported case sent for hallmarking. These marks are rare.

3. From 1 June 1907

   Every imported gold or silver watch case had to be assayed in Britain and struck with an import town mark (table above) and a decimal standard, such as ·925 in an oval for sterling or 9 and ·375 for 9ct gold.

The ·925 oval: the quickest tell

A British-made silver case shows the lion passant. An imported one assayed after June 1907 shows ·925 in an oval and an import town mark instead.

London's import mark is the sign of Leo, struck upside down until 1950, which is why it often looks like an odd squiggle. The date letter follows the office's usual cycle.

Swiss marks you may find alongside

Switzerland hallmarked gold and silver watch cases from 1882:

• Helvetia's head: 18ct gold (0.750)
• Squirrel: 14ct gold
• Bear: 0.875 silver
• Grouse: 0.800 silver
• Three bears with 0.935: silver cases for the British market, after 1887

No British marks at all?

That is normal for a Swiss case sold before June 1907, and for American cases at any date: America never had a hallmarking system, so its cases carry makers' stamps and fineness claims instead.

The movement usually settles the origin; see English vs Swiss gold watches.

Sources: David Boettcher, marks in watch cases; Boettcher on the inverted Leo; David Boettcher, Swiss hallmarks.

No Queen's head? Duty, jubilee and other marks

Words such as "Sterling", "0.800", "14K" or "warranted" on their own are the maker's claims, not hallmarks. A valid British hallmark always has all four marks.

Sources: David Boettcher, British hallmarks on watch cases; silvermakersmarks.co.uk, London.

What the hallmarks mean for value, and how we can help

The hallmark proves the metal and gives a date, which sets a floor: an 18ct case is worth at least its gold, at today's gold price. The real value sits in the maker, the movement, the condition and whether the watch runs, which is why we value the whole watch, not just the case.

1. Send photos

   The dial, the open case back with the marks in focus, and the movement if it opens easily. Use the form below or WhatsApp.

2. Free valuation

   We read the marks, identify the watch and tell you what it is worth. See how we buy pocket watches: directly, paid by bank transfer.

3. Or come in

   Mayfair (47 Maddox Street, by appointment) or Braintree, Essex. Call 01376 334482 or WhatsApp us, or contact us.

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