Islamic - Early Pre-Reform. ARAB-SASANIAN: Yazdigerd type, 652-668, AR drachm (3.52g), SK (Sijistan), YE20 (frozen date), A-1, Malek-946 ff, first Islamic coin, distinguished from the last regular Sasanian issue of the same year by the addition of Arabic bism Allah in the second obverse quarter, struck for close to 15 years without change of date, lovely VF+.