Cut off fragment.
A ducat weight of the Warsaw Mint from the early partition period (with the initials of the administrator Jakub Bienik).
Designed mainly for weighing ducats of Stanislaw Augustus, the Duchy of Warsaw and Dutch ducats.
Highly rare in Bitkin's catalog (additionally not illustrated with a photo, but with an engraving).
Brass, diameter 21 mm, weight 3.17 g.