This is a fairly rare type and for this reginal year, Emmett noted only one example.
Claudius II
A.D. 268- 269
Alexandria, Egypt
Ӕ Tetradrachm
20x22mm 10.8gm
OBV: AVT K KΛAVΔIOC CEB; Laureate, draped and cuirassed bust right.
REV: Poseidon standing left, right foot resting on dolphin, holding torch in right hand and sceptre in left, in front regnal year LB
Emmett 3893