Watch List notes:

LORDSHIP OF MYTILENE (LESBOS). DORINO GATTILUSIO, 1428-1449. Ducat of Old Phocea of Venetian type. DORINVS G. T. / D (reversed).FOLIE / DVX Rv. Chr.ist in mandorla, a pellet between his feet, SIT. T XPE DAT. Q TV - REGIS. ISTE DVCAT. 3.50 g. Lunardi D3 var., Schlumb. XVII, 6, Ives XII, 4.
Very fine

Ex Numismatik Lanz, München, Auktion 65, 8. 6. 1993, lot 952.