Watch List notes:

The Eparch Collection of Roman, Byzantine and Islamic Weights
ISLAMIC WEIGHTS

Circa 4th-6th centuries. Uncertain (Bronze, inlaid with silver, 17x17x7mm, 19.03 g), a thick, square commercial weight, with a flat top and bottom, very slightly beveled, and flat edges (as MAH B3), unit of 3.80 g (?). Latin cross, engraved and inlaid with silver. Rev. Five circular punch marks, at each corner and in the center. No parallel found: Bendall -. MAH -. Tekin -. Clear and with smooth surfaces. About extremely fine.

From the Eparch Collection.
This is an interesting and well-made weight, but what it is is something of a mystery.