Poland
Duchy of Warsaw (1807-1815) - Frederick August I (1806-1827).
Av: Duke's head to the right, around FRID AVG REX SAX DVX VARSOV; Rw: Crowned, two-circle shield with the Polish Eagle and coat of arms of Saxony, wreath of palm branches on the sides of the shield, at the bottom initials I - B (manager of the Warsaw mint Jakub Benicke)
silver, 22.66 g, coin removed from setting, soldered edge