Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1652 
Martini, Pangerl 7
ARAT
square 
5 x 5 mm 
Uncertain mint in Gaul (Gaul)
A RAT(ionibvs) was the title for the top imperial fiscal administrator within designated area of operation (Finance Minister) 
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Coins with this countermark

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