A beautiful, select mint piece.
Obverse: Portrait variety "large head", royal bust wearing crown, armor and cloak clasped with oval clasp, below it a dot, to the right, in the rim a legend:
D-G-AVGVSTVS-IIIREX-POLONIARUM;
Reverse: crowned five-field escutcheon with the coats of arms of the Crown, the Grand Duchy of Lithuania and the coat of arms of Saxony surmounted by the Elector's mitre, girded from below with a palm wreath, on the sides of the 5 branches of the wreath initials E-C of Ernest Dietrich Croll administrator of the mint in Leipzig in 1753-1763, between the branches the denomination mark 18, variety with a dot after the date, in the rim legend:
SAC-ROM-IMP-ARCHIM-ET ELECT-1755-;