Countermark

https://rpc.ashmus.ox.ac.uk/countermark/828 
GIC 709 corr.
ΔΘ
rectangular 
6.5 x 3 mm 
The initial reading of this countermark in GIC (uncertain letters, ΟΣ or ΑΣ) should be corrected in 'ΔΘ' (had already been changed to ΔΟ 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 1357 Show 1357 2 1
RPC I, 1357 Show 1357 7 1
RPC I, 1357 Show 1357 10 1