GREECE: 1 Drachma (1851) (type IIa) in silver with mature head of King Otto facing left and inscription "ΟΘΩΝ ΒΑΣΙΛΕΥΣ ΤΩΝ ΕΛΛΗΝΩΝ". Variety: Small head of King Otto. The dies manufactured in 1846 by Lange but were not approved. Those coins were minted by mistake but circulated normally. Inside slab by NGC "AU 53 - SMALL HEAD". (Hellas 109a). Very rare in this condition!