Countermark

https://rpc.ashmus.ox.ac.uk/countermark/928 
GIC 813
denominational mark Ϛ
circular 
6.5 mm 
Sometimes on reverse 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC X, — (number not assigned), type ID 61345 Show 1598 6 10
RPC X, — (number not assigned), type ID 61345 Show 1598 5 10
RPC X, — (number not assigned), type ID 61345 Show 1598 1 10
RPC X, — (number not assigned), type ID 61345 Show 1598 2 10
RPC X, — (number not assigned), type ID 61346 Show 1597 1 10
RPC X, — (number not assigned), type ID 61347 Show 1627 4 10
RPC X, — (number not assigned), type ID 61348 Show 1628 6 10
RPC X, — (number not assigned), type ID 61348 Show 1628 4 10
RPC X, — (number not assigned), type ID 61348 Show 1628 3 10
RPC X, — (number not assigned), type ID 61350 Show 1626 1 10
RPC X, — (number not assigned), type ID 61352 Show 1625 11 10
RPC X, — (number not assigned), type ID 61352 Show 1625 3 10
RPC X, — (number not assigned), type ID 61357 Show 1634 5 10
RPC X, — (number not assigned), type ID 61357 Show 1634 9 10
RPC X, — (number not assigned), type ID 61357 Show 1634 10 10
RPC X, — (number not assigned), type ID 82877 Show 1636 2 10
RPC X, — (number not assigned), type ID 61358 Show 1642 3 10
RPC X, — (number not assigned), type ID 61358 Show 1642 4 10
RPC X, — (number not assigned), type ID 61358 Show 1642 2 10
RPC X, — (number not assigned), type ID 61358 Show 1642 7 10
RPC X, — (number not assigned), type ID 61358 Show 1642 13 10
RPC X, — (number not assigned), type ID 61362 Show 1640 5 10
RPC X, — (number not assigned), type ID 61363 Show 1643 1 10
RPC X, — (number not assigned), type ID 61363 Show 1643 4 10
RPC X, — (number not assigned), type ID 61519 Show 1683 12 10
RPC X, — (number not assigned), type ID 61345 Show 1598 9 10
RPC X, — (number not assigned), type ID 61345 Show 1598 13 10