45mm. By L.C Wyon. Struck by The Royal Mint.
Obverse with diademed bust of Victoria, reverse named within wreath to 'Section D - The Patent Steam Boiler Co - Of Birmingham'.
Good Extremely Fine and housed in original case of issue (lid detached). Very rare with the Mint report for 1882 recording that 79 medals were struck, without specifying the breakdown for different metals.