Countermark

https://rpc.ashmus.ox.ac.uk/countermark/885 
GIC 751
denominational mark Β
rectangular 
Rectangular or shaped punch 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
Show 113
Show 112
Show 116
Show 114
Show 108
Show 171
Show 128
Show 129
Show 126
Show 43
Show 54
Show 52
Show 52
Show 217