This is just a fragment of a trojak, but how specific! Allowing full identification of what, very rare, trojak part it is.
Olkusz trojak 1580 in one of the most difficult to obtain varieties - with a small head and Jastrzębiec coat of arms.
The coat of arms of Peter Zborowski, very briefly placed on coins. Zborowski began placing it only after the death of Jakub Rokossowski, who died on July 2, 1580. However, the issue was continued less than three months later, as he had already died on September 13, 1580.
Silver, dimensions 13 x 13 mm, weight 0.86 g.