I believe this issue is RIC 1 438- struck 7 BC. 27.5 mm, 9.67g. Augustus bare head left- with SC reverse. The intriguing thing is the Caligula counter mark CAESAR added on obverse. CNG thinks it was applied in the Novaesium military encampment. See also Pangerl 43. Joe Geranio Collection, may be used by Numista. 
RIC 1 428. With rare Caligula C/M. Joe Geranio Collection.
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Roman Empire • As - Augustus (P LVRIVS AGRIPPA IIIVIR A A A F FS C)
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