Watch List notes:

'Abbasid Caliphate. temp. Al-Rashid. AH 170-193 / AD 786-809. AV Dinar (17.1mm, 4.02 g, 6h). Without mint-name (struck in Egypt). Dated AH 173 (AD 789/90). Citing 'Umar in fourth line of reverse field. SICA 3, 1837 (same dies); Bernardi 66; Album 218.8. Clipped. Near VF.

The person cited on the reverse of this coin is 'Umar b. Ghaylan, who was governor of Egypt from AH 173-4.