Watch List notes:

'Abbasid Caliphate. Al-Mahdi. AH 158-169 / AD 775-785. AR Dirham (24.4mm, 2.89 g, 11h). Arran mint. Dated AH 166 (AD 782/3). Vardanyan 123; SICA 3, -; Album 215.1. Toned, minor deposit. Good VF.