Watch List notes:

EGYPT, Alexandria. Severus Alexander. AD 222-235. Potin Tetradrachm (23mm, 8.58 g, 12h). Dated RY 7 (AD 227/8). Laureate, draped, and cuirassed bust right, seen from behind / Head of Zeus-Ammon right, wearing solar disk and horn. Köln –; Dattari (Savio) 4400; K&G 62.96; RPC VI Online 10382; Emmett 3147.7. Considerable roughness on obverse, thin and underweight for issue. Fine. Very rare, only six specimens known to RPC.

From the Rocky Mountain Collection of Alexandrian Coins.