The Birmingham Assay Office — Complete Guide

The Birmingham Assay Office is the world's busiest silver and precious-metal assay office, and its anchor town mark sits on a vast share of British silver, jewellery and giftware made since 1773. The office was founded by Act of Parliament — won for the city by the industrialist Matthew Boulton — to spare Birmingham silversmiths the journey to Chester or London, and within decades the city's Jewellery Quarter became the centre of the British silver trade. Understanding the Birmingham hallmark is essential for valuing British silver from the late Georgian period onward.

This guide explains the office's history, the anchor itself, the full Birmingham hallmark sequence, the date-letter system, sterling and Britannia standards, duty marks and the most common pitfalls when attributing Birmingham silver and jewellery.

A Brief History — Matthew Boulton and the Anchor

Until 1773 silver made in Birmingham had to be sent to Chester for assay — a 70-mile round trip that, according to local lore, lost as much silver to highway robbery as to the assay shavings. Matthew Boulton, of the famous Soho Manufactory, led a successful Parliamentary campaign and the Birmingham (and Sheffield) Assay Offices were established by Act in 1773.

The legend that the Birmingham and Sheffield town marks (an anchor for Birmingham and a crown for Sheffield) were chosen by the toss of a coin at the Crown & Anchor Tavern on the Strand in London is endlessly repeated. It is probably apocryphal, but the marks have remained unchanged since. The anchor is therefore the single defining mark of Birmingham-assayed silver — recognised globally and used on everything from canteens of cutlery and tea services to wedding rings.

How to Read a Full Birmingham Hallmark

A complete Birmingham hallmark is a row of small punches struck on a discreet part of the piece — the underside of a base, the bezel of a small box, the inside of a ring shank. From left to right, the standard sequence is:

1. Maker's (sponsor's) mark — the silversmith or retailer's initials in a shaped shield.
2. Standard mark — a lion passant (sterling, .925) or Britannia figure (Britannia, .958).
3. Town mark — an anchor, confirming Birmingham assay.
4. Date letter — a single letter in a shaped shield indicating the year of assay.
5. Duty mark (1784–1890 only) — a sovereign's head, struck to show duty had been paid.

A full row of Birmingham hallmarks: maker's mark, lion passant (sterling), anchor (Birmingham) and date letter.

The Anchor, Up Close

The Birmingham anchor is unmistakable — a vertical-shanked anchor with cross-stock, struck within a shaped shield. Over the centuries the shield outline has shifted (rectangular and rounded variants), but the anchor itself has not changed. On worn pieces, the anchor often survives best because of how deeply the punch is struck. Counterfeit Birmingham silver is usually given away by a flat or "printed" anchor without surrounding displaced metal at the punch edge.

Birmingham town mark: the anchor — used unchanged since 1773.

The Date Letter System

Birmingham changed its date letter every July (1 July, originally — the practice has evolved). Each cycle runs through letters of the alphabet, with the shield shape, letter style and case all changing at the start of the next cycle. As with London, that combination of letter, shield and font is what dates a Birmingham piece exactly. The same letter recurs every 25 years (Birmingham used a 25-letter cycle for much of its history) so the shield style is critical.

A letter alone is rarely enough — match it to the shield shape and font cycle. Send us photographs of the marks and we will date them for you.

Sterling and Britannia Standards

Birmingham assays both standards:

• Sterling — .925 (92.5% silver), marked with a lion passant. The default standard.
• Britannia — .958 (95.84% silver), marked with a seated Britannia figure. Birmingham only began offering Britannia assay relatively recently compared with London, but high-end modern pieces are sometimes Britannia-marked.

For most antique Birmingham silver (the great mass of Georgian, Victorian and Edwardian production) you will see the lion passant — sterling at .925.

Duty Marks — The Sovereign's Head

Between 6 December 1784 and 30 April 1890, the British government levied a duty on hallmarked silver and the Assay Office added a fifth mark — a small profile of the reigning sovereign. Birmingham used the same duty-mark sequence as London:

• George III — 1784 to 1820 (incuse, small, then larger).
• George IV — 1820–1830.
• William IV — 1830–1837.
• Victoria (young head) — 1837 to early 1890.

From May 1890 the duty mark vanishes. Post-1890 Birmingham silver therefore shows four marks; pre-1890 pieces show five.

The Jewellery Quarter and Birmingham's Speciality

The Birmingham Assay Office's huge output reflects what the Jewellery Quarter actually made. London specialised in fine domestic and presentation silver; Birmingham specialised in small silver, jewellery, novelty and giftware — vesta cases, snuff boxes, card cases, pencils, scent bottles, cigarette cases, mounted jugs and condiments, silver-mounted writing equipment, christening sets, wedding rings, brooches and chains. If you have a small silver object, the chances are it carries an anchor.

That specialisation also explains why Birmingham assays more articles by volume than the other UK offices combined: the Jewellery Quarter remains the production centre for UK silver jewellery today.

The Modern Birmingham Hallmark

The 1973 Hallmarking Act unified UK assay procedure. From January 1999 the date letter became optional (most makers still include it). The 1999 Convention introduced an additional common control mark for international trade. Since 2007 a millennium "M" mark appears on commemorative items. The Birmingham anchor remains constant. The Assay Office is now based in Newhall Street and processes millions of articles a year.

Notable Birmingham Silversmiths

A selection of Birmingham-marked names worth identifying:

• Matthew Boulton & the Soho Manufactory — the office's founding figure; Boulton-marked silver is highly collectable.
• Nathaniel Mills (1825–1856) — the king of "castle-top" silver vinaigrettes, card cases and snuff boxes with relief-cast views of famous buildings.
• Hilliard & Thomason — fine vinaigrettes and small silver.
• Joseph Willmore, Edward Smith, Yapp & Woodward — all important Birmingham small-silver makers.
• Elkington & Co — pioneers of electroplate (most "EPNS" marks are theirs), but they also produced significant sterling silver under Birmingham marks.
• Liberty & Co Cymric range (Archibald Knox designs) — early 20th century Arts & Crafts pieces with the anchor.

Nathaniel Mills castle-top pieces in particular can be worth many times their silver content — never sell a "Mills" vinaigrette as scrap.

Pitfalls and Forgeries

• EPNS, A1, EP, "Silver on Copper" — these are not Birmingham hallmarks. They are electroplate marks (often Elkington's) and contain no solid silver. Birmingham did not assay plated wares.
• Re-let-in marks — a genuine anchor cut from a damaged piece and soldered into a new (often plated) base. Look for a faint solder ring around the marks.
• Cast hallmarks — real marks are struck and show metal displacement at punch edges. Cast or transferred marks are recessed without that flow.
• Date letter / maker mismatch — a maker's mark used outside their dates is a clear giveaway.
• Worn marks — the anchor usually survives best because of punch depth. Even on rubbed pieces, the anchor and lion are normally still readable.