This coin is not listed in RIC with the B5 bust (laureate & cuirassed). Only two bust types are listed, B1 (head laureate) and B3 (laureate, draped, cuirassed, seen from back). It should come after RIC 123.
It is listed in Bastien as # 76, with one example noted- second pic below.
Another example here-
http://www.forumancientcoins.com/notinric/7lyo-123.htmlInterestingly, all three have different obverse dies.
Constantine II
A.D. 321
19mm 3.1gm
D N CONSTANTINO IVN N C; laureate and cuirassed bust right.
VIRTVS-EXERCIT; Standard inscribed VOT/XX with captive seated on ground on either side, C/R in fields.
in ex. PLG
RIC VII Lyons –; Bastien 76
third picture below is the picture I took after receiving the coin
