Watch List notes:

LORDSHIP OF CHIOS. FILIPPO MARIA VISCONTI, 1421-1436. Ducat of Venetian type. St. Peter gives a banner to the kneeling duke, D MEDIOIIANI / S PETRVS / DVX Rv. Chr.ist in mandorla, SI.T. T. XPE. DA.T Q - REGIS ISTE DVA 3.41 g. Schl. XIV, 14, Lambros 50.
Very fine

Some of the letters have interesting forms, the C's are reversed D's, and the S's are reversed E's.