Watch List notes:

The Mašek Collection of Czech and European Gold Coins | Austria, Joseph II (1780-1790), Ducat, 1787 A, Vienna, laureate head right, rev. crowned Imperial double-headed eagle, edge obliquely milled, 3.47g, 12h (Fb. 439; Herinek 29; KM 1873), light surface marks behind head and latterly conserved by NGC, otherwise lustrous, almost extremely fine, in NGC holder, graded AU Details ~ Cleaned (Cert. #6135289-005)

Provenance
The Mašek Collection of Czech and European Gold Coins