Poland Gdansk 1 Ducat 1660 DL John II Casimir Vasa (1649–1668). Averse Lettering: IOH CAS D G R POL & SUEC M D L R P. Reverse Lettering: MON AUREA CIVITAT GEDANENS 1660 D-L. Gold. KM 41.2. H-Cz. 6731 (R); Fr. 24; Tyszkiewicz 14 mk. Kop. 7662 (R4) RARE NGC UNC DETAILS