Watch List notes:

ABBASID, AL-MUSTA'IN (248-251h). Dinar, Arminiya 249h. Obverse: In field: citing the caliphal heir al-'Abbas bin | amir al-mu'minin. Weight: 4.23g. Reference: Bernardi type 161 (unrecorded for this mint). Small file-mark on rim, otherwise good very fine and excessively rare, apparently unpublished
(5000-7000' GBP)