A GEM!
AE As (29mm, 8.82g, 6h). Rome mint, struck 86, interstitial issue, bgnia.
IMP CAES DOMIT AVG GEM COS XII CENS PER P P, head laureate right, with aegis; S C in field, Mars advancing left, with Victory and trophy.
RIC 486 (C2*) var, obverse inscription GEM.
Ex NAC, ex AMP coll., ex Helios 6.
