https://en.numista.com/catalogue/pieces259580.html
Become visible after moving Lithuanian coins minted before Union from Polish branch to Grand Duchy of Lithuania.
Same coin. First one got wrong mint set. Time machine is not invented yet. Second one got coin mass wrong. 4 groat coins were minted from 1565 to 1569, weighed 4.29 grams and had 14 lot fineness (.875). Lighter 3.76 gram variant listed in 1993 catalogue, but now it is classified as counterfeit ( https://www.limis.lt/valuables/e/805209/393282635?searchId=37258748 ). 4.0 grams are probably due to wear (compare wear on https://www.limis.lt/valuables/e/805446/190000032887685?searchId=35367866 with https://www.limis.lt/valuables/e/806434/36228807?searchId=66576566 ) or rounding.
Maybe delete second one, merge references from it to first page and change mint to “Vilnius, Lithuania (1340-1666)” on first one.
