Forgery of Majnert, the crown thaler of Sigismund I the Old.
Unique coin on the auction market.
Obverse scratched.
Obverse: bust of the king wearing a crown facing right
SIGIS PRIM REX POL MD LI
Reverse: coats of arms of Poland, Lithuania, Red Ruthenia, Royal Prussia and Austria
RVSS TO PRVSS ET MAZO D ET HERES
Diameter 40 mm, weight 29.27 g