Lead Gnostic Tessera of Egypt, 18 mm, 3.22 g. Ca. 2nd-4th century AD. 

IAω beneath Abraxas with serpent legs, holding whip and shield.
ABRA CAX beneath crescent with one star. 

Leu 3, 194.

With permission of Leu Numismatik AG Auction 3, Lot 194, Oct. 2018.