Watch List notes:

Umayyad Caliphate, Gold coinage. AV Dinar (19.2mm, 4.24 g, 8h). Without mint-name. Dated AH 100 (AD 718/9). Pellet below b of duriba in reverse margin. ICV 189; Walker 216. Light graffiti. Near EF.

This is the only date for Umayyad gold which can be assigned with certainty to the caliphate of 'Umar.