Watch List notes:

Poland, Duchy of Courland, Peter Biron (1769-95), Ducat, 3.46g, 1780, head right, rev. crowned shields (F.4; HCz.3409 - R3), good very fine.
provenance
Purchased from Spink, 5 May 1958, £9.7/6d
Estimate: £1,500.00 - £2,000.00