Countermark

https://rpc.ashmus.ox.ac.uk/countermark/390 
GIC 267
Telesphorus (on reverse)
oval 
5 x 3.5 mm 
On reverse 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC III, 1728 Show 1728 5 3
RPC III, 1728 Show 1728 1 3
RPC III, 1729 Show 1729 8 3
RPC III, 1727 Show 1727 8 3