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The Romans repeated the last letter of abbreviations to indicate multiples. The two G's at the end of the reverse legend indicate two Augusti - Septimius Severus and Caracalla.
14936. Silver denarius, RIC IV 107, RSC III 37, VF, Rome mint, 3.76 g, 17 mm, 197 - 198 A.D.; obverse L SEPT SEV PERT AVG IMP X, laureate head right; reverse ANNONAE AVGG, Annona standing left, foot on prow, heads of grain in right, cornucopia in left;