Szóstak / 6 Groszy - Jan III Sobieski Bydgoszcz mint

Jan III Sobieski's szóstak was struck across multiple years at Bydgoszcz during a reign defined by near-constant military expenditure — most acutely the campaigns against the Ottomans culminating in the 1683 relief of Vienna. The Commonwealth's minting apparatus during this period was chronically underfunded and plagued by leaseholder arrangements that incentivized volume over quality, which is why so many examples from this run show irregular planchets and uneven striking pressure.

The Kop references span five distinct die varieties across the decade-long production window, suggesting meaningful variation in workshop dies rather than a single continuous issue.