Countermark

https://rpc.ashmus.ox.ac.uk/countermark/530 
GIC 408
ear of corn
rectangular 
6 x 3 mm 
may have been applied at Neapolis (Samaria), but provenances give some reason to doubt. 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC II, 2218 Show 2218 7 2
RPC II, 2218 Show 2218 16 2
RPC II, 2021 Show 2021 45 2
RPC II, 2021 Show 2021 48 2
Show 144