Watch List notes:

BYZANTINE WEIGHTS. Theodoros, eparchos, Circa 6th-7th century. Weight for 1 semissis (Glass, 18.5 mm, 2.20 g). Crusiform monogram of ΘEOΔΩPOY. Rev. Plain. Very fine.


The reason why glass was used for coins weights is because their brittleness meant that they could not be fraudulently altered. Many have expressed doubts that they are actually weights since they do not always correspond to a specific denomination.