Very rare denomination and year of 1/4 ducat of Augustus III of Poland
Coin definitely rarer than the rarities acknowledged in the literature.
Obverse: bust right
D G FRID AUG R P D S I C M A & W
Reverse: crowned five-field ornamental shield, under the shield hood and the initials FWôF of Friedrich Wilhelm ô Feral, mintmaster of the Dresden mint in the years 1734-1763
S R I ARCHIM ET ELECT
Gold, diameter 17 mm, weight 1.73 g