Watch List notes:

ABBASID: al-Ma'mun, 810-833, AR 1/6 dirham (0.41g), Marw, AH(202), A-223K, date confirmed by die-link (both sides) to the only other known example of this type, sold in our Auction 39, Lot 175 (holed and lesser quality, 0.43g), VF-EF, RRR.

Estimate: 300-400 USD