Watch List notes:

ARAB-SASANIAN: Yazdigerd type, 652-668, AR drachm (3.79g), BN (perhaps Bamm), YE20 (frozen), A-1, the first Islamic silver coin, bold strike, EF, RRR. A most remarkable coin, with only Arabic bism instead of the correct bism Allah, with no evidence that this coin might have had Allah scratched off the coin. Either the engraver simply forgot to include the name Allah (God forbid!) or the engraver was opposed to Islam and unofficially created a die lacking the holy name Allah.

Estimate: 600-800 USD