Szóstak / 6 Groszy - Sigismund III Vasa Bydgoszcz mint

The szóstak was introduced to Polish coinage in 1528 under Sigismund I as a practical denomination bridging the gap between the grosz and the larger talar. By Sigismund III's reign, Bydgoszcz had become one of the Commonwealth's primary minting centers, operating under lease arrangements with private mint masters whose profit motives frequently led to gradual debasement — a chronic complaint lodged by merchants and the Sejm alike throughout the 1590s.

Kopicki references 1238 through 1252 span multiple annual varieties, with differences in crown shape and ornamentation distinguishing individual die pairings across the run.