Sheet metal defects.
Issue attributed by Zhukowski to Kraków, while by Ciura to Bydgoszcz.
Variety with the Leliwa coat of arms in the Iberian shield on the reverse.
Obverse: royal bust in antique style, to the right, in the rim legend:
IOAN-III D-G-REX POL-M-D L-R-P;
Reverse: crowned four-cornered crown with five trefoil fleurons, with jewels on the bails, a three-field escutcheon, with the coats of arms of the Crown of the Kingdom of Poland, the Grand Duchy of Lithuania and the Sobieski family coat of arms - Janina, under the crown the denomination mark VI, under the escutcheon the date 16-80; in the rim the legend divided by the Leliwa coat of arms in an oval escutcheon:
GROS-ARG-SEX-REG-POLONIAE;
