Countermark

https://rpc.ashmus.ox.ac.uk/countermark/678 
GIC 549
ΛΑΛΛ (?)
rectangular 
10 x 4 mm 
?= ΛΑΜ or {ΜΑ}Μ 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
Show 331
Show 344