QARMATID, AL-HASAN B. AHMAD (fl. 361-364h) Dirham, Filastin 361h. Obverse: In field: al-Sadat | al-ru'asa. Reverse: In field: al-Muti' lillah | al-Hasan b. Ahmad. Weight: 2.51g References: Vardanyan -; cf Morton & Eden auction 85, 27 April 2017, lot 488. Overstruck on a Fatimid dirham of al-Mu'izz, fair and VERY RARE