Watch List notes:

Egypt, Alexandria. Gaius Caligula. A.D. 37-41. AE dichalkon (15.5 mm, 2.37 g, 1 h). Dated RY 2. Ibis standing left; branch before / Apis bull standing right; L B (date) above. RPC I, 5112; Köln 3444; Dattari (Savio) 112; K&G A.3; Emmett 4257.2. Fine, porous.

RPC classifies this coin under "Coins probably incorrectly attributed to Caligula" but it certainly falls into the Julio-Claudian era.