Constantine II, AE3, Lyons. 337-348 AD

CONSTANTINVS IVN NOB C, laureate, draped, cuirassed bust right.
Rev: GLOR-IA EXERC-ITVS, two soldiers holding spears and shields 
with one standard between them with o on banner.
Mintmark: (can only be SLG)

RIC VII Lyons 271, rated R5.

This coin does not have a legible mintmark BUT the ONLY coin 
(from all the 1,368 known official varieties of the one standard 
type) which has 
- an unbroken obv. legend beginning with CON and ending with N NOB C
- a laureate, draped and cuirassed bust
- the GLOR-IA EXERC-ITVS reverse break
- this rectangular banner type (so typical of Lyons)
is 
RIC VII Lyons 271

simples !

Contributed by Pete Clegg (biffabacon10), Nov, 2010