Crown coins, Ort, 1655, Kraków; letters I - T (Jan Thamm, mincmaster) under bust of ruler, in obverse legend IOAN CASIMI...P & S, in reverse legend ARGENT REGNI PO..., under shield emblem of Wieniawa coat of arms and letters SCH (Stanislaw Chrząstowski, mint manager); Kop. 1734, Kurp. (1649-1696) 360, Shatalin KR55-I-20; patina; coin from Tadeusz Kalkowski's collection (original envelope preserved), the reverse of this piece illustrated on page 254 of the book "Thousand Years of Polish Coinage (item 109 in the first edition).