Constantine II. AE. London.

FL CL CONSTAN-TINVS IVN N C, laureate, draped, cuirassed bust right, seen from the back.
VICTORIAE LAETAE PRINC PERP, two Victories holding 
shield inscribed VOT PR over altar. Altar type Helvetica 3c.

Mintmark: PLN

RIC VII London 180 var (bust type). RIC 180 is rated R3.

From Malcolm Skeels' collection, Forum ancient coins, March 2010.

RIC 180 lists only the normal laureate, draped, cuirassed 
type bust, not seen from the back.