Signed in section of the arm G.W.
Very rare.
Silver, diameter 42.5 mm, weight 28.89 g.
Obverse: bust of the king in a long wig, to the right, in a double border the legend:
FRIDERICVS AVGVSTVS DEI GRATIA REX POLONIAE/SACRI ROMANI IMPERII ARCHIMARESCHALLVS ET ELECTOR
Reverse: family tree from Casimir IV Jagiellon, to Frederick Augustus, in shield: ELECTVS/D 17/27 IVNII/CORONATVS/D 5/15 SEPT./M D C III CA, in rim: POLONIS SANG: VINEIVNCTVS