World coins
The Caliphate
Abbasid, Tabaristan, coll. Hemidrachm, Sulayman bin Musa, AH 171-173 (787-789 AD), 137 PYE (788 AD), Album 65, 2.19 g, 2.23 g, 2.00 g, 1.88 g, 1.64 g, 1.84 g, 1.84 g, 1.93 g; al-Mahdi, AH 158-169 (775-785 AD), Album 56, 1.95 g, 2.00 g; Harun al-Rashid, AH 170-193 (786-809), 2.12 g. (11)