https://rpc.ashmus.ox.ac.uk/countermark/727 

GIC 601

SIT

rectangular 

10 x 5 mm 

Cirta (Africa)

Sittius. The countermarks allowed the coins to circulate alongside the issues with the name of P. Sittius Mugonianus st Cirta, perhaps after 26 BC (cf. Mazard p.155). Coins from Gades show circulation between Spain and North Africa, cf. GIC 419