Countermark

https://rpc.ashmus.ox.ac.uk/countermark/737 
GIC 611 corr.
monogram ΡΚΑ
The initial reading of this countermark in GIC (uncertain monogram (?), begining Β) should certainly be corrected into 'monogram ΡΚΑ' 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 1787 Show 1787 1 1
RPC I, 1788 Show 1788 1 1
RPC I, 1788 Show 1788 2 1
RPC I, 1787 Show 1787 4 1
RPC I, 1787 Show 1787 5 1
RPC I, 1787 Show 1787 2 1
RPC I, 1787 Show 1787 6 1
RPC I, 1787 Show 1787 7 1
RPC I, 1787 Show 1787 8 1
RPC I, 1787 Show 1787 9 1
RPC I, 1787 Show 1787 10 1