How to Identify the British Brass Threepence
Collector checks for the twelve-sided brass threepence: shape and colour, George VI head, thrift-plant reverse, size and weight, and reign look-alikes.
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Begin with the two features that identify the type at a glance: it is twelve-sided and struck in golden nickel-brass. If a coin marked THREE PENCE is round, or silver-coloured, it is an earlier silver threepence and not this brass issue. The faceted edge and warm yellow tone are the quickest confirmation.
Read the obverse. The type shown carries the bare, left-facing head of George VI with an abbreviated Latin legend running around the rim. Then turn to the reverse and look for the thrift plant, a small clump of flowers on upright stalks above THREE PENCE, with the date at the bottom, here 1942. The thrift design ties the coin specifically to the George VI reign.
Cross-check the physical standard. A genuine brass threepence weighs about 6.6 grams, measures roughly 21 mm across the flats, and is noticeably thick. It is non-magnetic, so a coin that sticks to a magnet is not correct. A jeweller's scale and a caliper are enough to confirm the denomination and catch crude fakes or altered pieces.
Mind the reign look-alikes. The same twelve-sided brass coin continued under Elizabeth II from 1953, but with a different portrait and a crowned portcullis reverse instead of the thrift. So the reverse design, not just the shape, tells you which monarch's threepence you hold. There is no mint mark to find; all were struck at the Royal Mint, so use the obverse legend and date to pin down the exact coin.
Authentication is rarely a concern at this level because the coins are common and base-metal, but inspect the date digits under magnification on any piece claimed to be a scarce date, since altered dates are the main risk. For ordinary circulated examples, matching shape, colour, portrait, reverse, weight, and size is all the verification you need.
Frequently asked questions
How do I tell a George VI threepence from an Elizabeth II one?
Check the reverse. A thrift plant (flowers on stalks) means George VI; a crowned portcullis means Elizabeth II. The portrait and legend on the obverse also differ.
Is there a mint mark on the brass threepence?
No. All brass threepences were struck at the Royal Mint and carry no mint-mark letter. Identify the coin by its portrait, reverse design, and date instead.
What should a genuine brass threepence weigh and measure?
About 6.6 grams, roughly 21 mm across the flats, twelve-sided, thick in profile, and non-magnetic. A magnetic response or a very different weight signals a wrong or fake coin.
Could my threepence be silver instead of brass?
If it is round and silver-coloured it is an earlier silver threepence, a separate type. The brass threepence is always twelve-sided and golden-yellow in colour.