Watch List notes:

ABBASID: 'Abd al-Rahman b. Yazid, governor, 759-769, glass vessel stamp (11.51g), ND, B-448/451, for sealing a vessel containing ¼ qist of an unnamed liquid, VF. The term qist derived from the Greek word Χεστεσ, and can refer to different weights for different substances, but according to A.H. Morton should represent an amount between a half litre and a full litre.

Estimate: 600-800 USD