1763 Continental silver coin - 22.30mm, 16.7g
6 Groszy from Danzig (Gdansk) under Polish rule and the King August III.
Obv: Bust of King August III, "D G AVGVSTVS III REX POL M D L R P D S & E L"
Rev: Value VI over shield, "MON ARGNET CIVITAT GEDANENSIS"
Mintmaster is Rudolph Ernst Oeckermann (REOE), metal is billon (very low silver content).