Watch List notes:

(g) NGC MS64+ | The Mašek Collection of Czech and European Gold Coins | Austro-Hungary, Franz-Josef I (1848-1916), Ducat, 1880, Vienna, laureate head right, rev. Imperial double-headed eagle, 3.49g, 12h, edge milled (Fb. 493; Herinek 149; J.344; Frühwald 1239; KM 2267), stained and subsequently conserved by NGC, otherwise lustrous, extremely fine, in NGC holder, graded MS64+ (Cert. #6135187-003)

Provenance
The Mašek Collection of Czech and European Gold Coins