Countermark

https://rpc.ashmus.ox.ac.uk/countermark/609 
GIC 484
?, varioulsy described at a 'T', a 'hammer', or a 'poppy head'
 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 1801A Show 1801 1 1
RPC I, 1801A Show 1801 4 1