Watch List notes:

The Eparch Collection of Roman, Byzantine and Islamic Weights
COPTIC (?) WEIGHTS

Egypt, Fatimid Period or later. Circa 10th-11th century / 3rd-5th century AH. 2 Ounce = 33 1/3 Dirham Weight (Bronze, 29x29x15mm, 104.09 g), a very thick, square commercial-weight, of probable Coptic workmanship. He-goat walking to left, his head turned back to right, surrounded by floral ornaments; all within raised square border. Rev. Plain. A. Mazarakis, "Three Weights," NomXhron 28, 2010, pp. 95-104, fig. C (this piece). A bold and attractive piece with a dark brown patina. A very rare and extraordinary object. About extremely fine.

From the Eparch Collection, acquired from a private collection in London.
For the attribution of this piece see Mazarakis' article cited above.