Constantine I AE Follis. 

Obv: CONSTA-NTINVS AG, helmeted, laureate & cuirassed bust right 
Rev: VICTORIAE LAETAE PRINC PERP, two Victories holding 
shield inscribed VOT PR over altar. 
Altar type Helvetica 2b (diamond with dot in centre); 
Mintmark: PLN. 

RIC VII London 163 var (see below), rated  R5.

Contributed by Jim Buchholz, Dec. 2010. Anothjer sold on
ebay in Dec. 2008 by biggyg2.

* The difference between this coin and the normal RIC
163 is that RIC lists an altar type (Helv. 2d) which
has a dot at inner corner of the altar.