Poland
Sigismund I the Old 3 Grosze (Trojak) 1528 VF Details (Surface Hairlines) NGC, Gumowski-532 (R), H-Cz 289, Iger only lists one variety, Iger T28.1a for the 1528, but this is actually a second variety, as the reverse legend reads ARGENTE:, not ARGENTE. This might be Iger T28.1b? Obv. Armored bust of Sigismund I right. Rev. Six-line legend. Nice portrait, with slightly soft reverse strike and minor hairlines in the obverse.
Estimate: 4000-6000 USD