Watch List notes:

Poland, Sigismund Augustus (1548-72), Ducat, 3.51g, 1550, Gdansk (Danzig), sigis. avg. rex. poloni. m.d. lit., crowned and cuirassed bust right, rev. mone. no. avr. civi. gedanen., city shield with supporters (F.2; cf.HCz.9372 - R4), wavy flan, extremely fine and lustrous, very rare.
provenance
Purchased 24 September 1969, £135
Estimate: £20,000.00 - £25,000.00