Constantine II, AE3, Rome, 330-331 AD. 17mm, 1.7gm. 

Obverse: CONSTANTINVS IVN NOB C, Laureate and cuirassed bust right 

Reverse: GLORIA EXERCITVS, Two soldiers holding spears and 
shields, to left and right of two standards with 3 badges
and dot on banners.

Mintmark RBT. 
RIC VII Rome 336 var (unlisted officina).

Unlisted in RIC for officina T, rare.

Contributed by Jerome of Rusty Romans on vcoins.com, Feb. 2012.