ISLAMIC, Time of the Rashidun. Yazdigerd type. AH 31-41 / AD 651-661. Drachm (Silver, 33 mm, 3.83 g, 3 h), Arab-Sasanian, Yazdgard type, SK (Sijistan), YE 20 = AH 31 = AD 651/2 (Frozen year). Draped bust resembling Khosrau II to right, wearing elaborate mural crown; behind head, AFZUT GDH ('may his kingship increase' in Pahlawi); before head, YZDKLTY ('Yazdgard' in Pahlawi); in outer margin, 'bism Allah' ('In the name of Allah' in Kufic). Rev. Fire altar with ribbons flanked by two attendants; in upper left field, six-pointed star; in upper right field, crescent; to left, date; to right, SK (name of the mint in Pahlawi). Album 6. SICA I, 353ff. Walker, Arab-Sassanian, p. 4, 3. Minor edge crack, otherwise, good very fine.
From the collection of J. Knudsen, formed from the late 1970s to the late 1990s.
This interesting type is the earliest definitive Islamic coin.