Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1547 
Martini, Pangerl 14
CIC
circular 
Grant attributed this to Colonia Ivlia Carcaso. However, the only example in Martini, Pangerl could be 15, D D with branch between, with the D's read as C's? 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 523 Show 523 184 1
RPC I, 523 Show 523 182 1