Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1551 
GIC 786 i
denominational mark Δ
incuse 
5 x 5 mm 
Applied at the same time as GIC 754 (Β ο). Callu suggested that the o stood for obols (he assumed 1 obol = 2 assaria). Sometimes on reverse. J Johnston (p. 217) suggested that the Δ 'appears to be engraved on the die'. 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC X, — (number not assigned), type ID 63878 Show 460 7 10
RPC X, — (number not assigned), type ID 63878 Show 460 8 10
RPC X, — (number not assigned), type ID 63878 Show 460 11 10
RPC X, — (number not assigned), type ID 63874 Show 464 6 10
RPC X, — (number not assigned), type ID 81221 Show 462 17 10
RPC X, — (number not assigned), type ID 81221 Show 462 7 10
RPC X, — (number not assigned), type ID 81221 Show 462 4 10
RPC X, — (number not assigned), type ID 81228 Show 463 4 10
RPC X, — (number not assigned), type ID 81228 Show 463 2 10
RPC X, — (number not assigned), type ID 63877 Show 461 1 10
RPC X, — (number not assigned), type ID 63877 Show 461 11 10
RPC X, — (number not assigned), type ID 63877 Show 461 14 10
RPC X, — (number not assigned), type ID 63877 Show 461 8 10
RPC X, — (number not assigned), type ID 63877 Show 461 7 10
RPC X, — (number not assigned), type ID 63877 Show 461 3 10
RPC X, — (number not assigned), type ID 63877 Show 461 2 10
RPC X, — (number not assigned), type ID 81228 Show 463 10 10
RPC X, — (number not assigned), type ID 81221 Show 462 9 10