RR-, Sigismund III Vasa, Shelrog 1625-7, Bydgoszcz two obverses, one-sided

An interesting shellac, the reverse convex, and on the obverse its negative reflection. Crown shekels of Sigismund III Vasa, are exceptionally diverse coins minted at several mints, and represent an interesting and still underrated collector's subject. Despite so far, not very high rarity ratings in catalogs, most of them are extremely difficult to collect due to poor minting in coinage silver. Very rare.