A very nice centrally deficient piece in dark patina.
Nicely preserved mint luster on the reverse.
The last vintage of gold coins with a type 3 head according to the typology of Parchimowicz and Brzezinski.
Obverse: head to the right, in the rim the legend:
STANISLAUS AUG.D.G.REX POL.M.D.L.;
Reverse: crowned five-field escutcheon with the coats of arms of the Crown, the Grand Duchy of Lithuania and the Ciołek coat of arms of the Poniatowskis, in a laurel wreath. Lower the initials of Efraim Brenna - E.B. and the denomination mark 4.GR., in the rim the legend:
LXXX EX.MARCH-PURA.COL.1785;