How to Identify the Cartwheel Twopence

Start with size and heft, because they are decisive. A genuine cartwheel twopence is about 41 mm in diameter and weighs roughly two ounces of copper — around 56–57 grams. Set it beside an ordinary penny and the difference is obvious; nothing in normal British copper approaches this mass. If a coin claiming to be a cartwheel twopence is noticeably light or thin, treat that as a warning sign before going further.

Examine the rim and lettering. The defining cartwheel feature is a broad, flat, raised outer rim with the legends sunk into it (incuse) rather than standing in relief. On the obverse the incuse legend reads GEORGIUS III D G REX around the right-facing armoured bust; on the reverse it reads BRITANNIA. Run a fingertip over the rim: the letters should be recessed. Raised, ordinary relief lettering points to a different coin or a modern copy.

Read the devices and date. The obverse carries the laureate bust of George III facing right. The reverse shows Britannia seated to the left with a trident and olive branch, a shield below her and a ship at sea to the side, with the date 1797 beneath. Every authentic cartwheel twopence is dated 1797 only — there is no other year — and the tiny word SOHO on the reverse records Boulton's Soho Mint. A cartwheel-style twopence bearing any other date is not genuine.

Rule out look-alikes. The 1797 cartwheel penny shares the same design and incuse-rim style but is smaller and about half the weight, so confirm the denomination by measuring and weighing rather than by design alone. Beware also of later restrikes, electrotypes, and cast reproductions sold as souvenirs; casts often show a seam at the edge, soft or bubbly detail, and a weight that does not match. Because the coin is heavily collected, gilt, lacquered, or artificially toned pieces also circulate.

Authenticate high-grade or high-price examples. Compare diameter, weight, and thickness against published specifications, inspect the edge for casting seams, and check that the incuse lettering is crisp and correctly spelled. Copper that looks unnaturally bright, uniform, or coated deserves caution. For any coin offered at a significant price or claimed as choice, seek a professional opinion rather than relying on appearance.