Unlisted variety in Łukasz Ciura catalogue, very similar to type 662.L.1.4.6.1 (R4), which also has RES in the obverse legend, but in this type there is REG PO in the legend of the reverse, and REG POL in the offered coin.
Variety with bust type VII acording to Ciura, with straight shields, with a Vasa cartouche decorated with bows, above which a trefoil, and on its sides the initials GB-A and the legend of the obverse IO CASIM and with RES in the obverse legend and with reverse legend REG POL.
Attractive coin with well preserved details and only slight signs of circulation.