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 1628 6 10
RPC X, — (number not assigned), type ID 61345 Show 1628 5 10
RPC X, — (number not assigned), type ID 61345 Show 1628 1 10
RPC X, — (number not assigned), type ID 61345 Show 1628 2 10
RPC X, — (number not assigned), type ID 61346 Show 1627 1 10
RPC X, — (number not assigned), type ID 61347 Show 1656 4 10
RPC X, — (number not assigned), type ID 61348 Show 1657 6 10
RPC X, — (number not assigned), type ID 61348 Show 1657 4 10
RPC X, — (number not assigned), type ID 61348 Show 1657 3 10
RPC X, — (number not assigned), type ID 61350 Show 1655 1 10
RPC X, — (number not assigned), type ID 61352 Show 1654 11 10
RPC X, — (number not assigned), type ID 61352 Show 1654 3 10
RPC X, — (number not assigned), type ID 61357 Show 1663 5 10
RPC X, — (number not assigned), type ID 61357 Show 1663 9 10
RPC X, — (number not assigned), type ID 61357 Show 1663 10 10
RPC X, — (number not assigned), type ID 82877 Show 1665 2 10
RPC X, — (number not assigned), type ID 61358 Show 1671 3 10
RPC X, — (number not assigned), type ID 61358 Show 1671 4 10
RPC X, — (number not assigned), type ID 61358 Show 1671 2 10
RPC X, — (number not assigned), type ID 61358 Show 1671 7 10
RPC X, — (number not assigned), type ID 61358 Show 1671 13 10
RPC X, — (number not assigned), type ID 61362 Show 1669 5 10
RPC X, — (number not assigned), type ID 61363 Show 1672 1 10
RPC X, — (number not assigned), type ID 61363 Show 1672 4 10
RPC X, — (number not assigned), type ID 61519 Show 1712 12 10
RPC X, — (number not assigned), type ID 61345 Show 1628 9 10
RPC X, — (number not assigned), type ID 61345 Show 1628 13 10