https://rpc.ashmus.ox.ac.uk/countermark/121 

GIC 5

Asclepius, bust r.

square or rectangular 

6 x 5 mm 

Aegeae (Cilicia)

Applied on either side of coin; For the importance of Asklepius at Aegeae see H. Bloesch, 'Caracalla in Aegeai', Congresso Internazionale di Numismatica, Rome 1961, vol.2, 1965, pp.307-12. For his temple: Price and Trell fig.395. For an alternative identification cf. SNG vA 8665 ('Poseidon').