Watch List notes:

Abbasid, temp. al-Mahdi/al-Hadi, Dinar, no mint, 169h, br in lower reverse field, 4.12g (Bernardi 56). Slightly bent at edge, otherwise very fine, scarce.

The br on the reverse is believed to refer to Ibrahim, who is cited on some dirhams of Madinat al-Salam dated 170h.