Watch List notes:

ABBASID: al-Mahdi, 775-785, AR dirham (2.50g), Tudgha, AH166, A-215.2, Lowick-478, reverse legend muhammad rasul / Allah sali Allah / 'alayhui wa salam, some light porosity on the reverse; rare mint in the Moroccan silver mining region, Fine, RR. After AH173, Tudgha became a relatively common mint for the Idrisids and briefly in 175-176 for the Kharijite ruler Khalaf b. al-Muda' (A-430).

Estimate: 140-180 USD