Half groschen Matthias Corvinus Duchy of Wroclaw

very rare denomination, much less common than a similar penny,
obverse: five-field heraldic shield,
reverse: St. John the Baptist in a nimbus with his head turned slightly to the right, in a girded robe, with his right hand pointing to a circle with a Lamb held in his left hand,
delicate patina,
rare coin;

Paszkiewicz: 1.15
Kopicki 8772 R4