58mm. By A.G Wyon.
Obverse with Vulcan facing right, holding hammer and chain, reverse with bellows, tongs and palm frond, legend around.
This is a extremely rare artist's proof of the bronze prize medal by Wyon. It was formerly the property of Allen Gairdner Wyon and thence held by the family by descent. The proposed new design was not adopted and to date the original medal is still awarded, as it has been since 1872.
About Uncirculated and extremely rare to have a Wyon artist's proof, particularly that of a medal design that was never actually adopted.