RR-, Sigismund III Vasa, Shelrog 1623, Bydgoszcz, R(EX) after Sas coat of arms, unlisted

A very rare shellac. Unlisted in both the Kaminski catalog and the new Kopick - variety with R(EX) behind the Sas coat of arms, instead of in front of the coat of arms as on almost all issues of that year. High rarity.