Watch List notes:

EGYPT, Alexandria. Trebonianus Gallus. AD 251-253. Potin Tetradrachm (23.5mm, 11.32 g, 12h). Dated RY 3 (AD 252/3). Laureate, draped, and cuirassed bust right, seen from the front / Serapis standing left, wearing kalathos, raising right hand, holding long scepter in left; L Γ (date) across fields. Köln 2838; Dattari 5118; K&G 83.10; RPC IX Online 2308; Emmett 3674.3. Slightly irregular flan, edge chips, mottled patina. VF.

From the Rocky Mountain Collection of Alexandrian Coins.