Watch List notes:

ISLAMIC, Egypt. Umar (?). Circa 8th century. Glass Vessel stamp (25mm, 4.99 g, 0h). 'mr and uncertain word (sl[...]) in Arabic in two lines / Blank. Cf. Miles, Early 35 (for type). Intact, olive green hue.

Reportedly purchased from Sotheby's in the 1980s.