Carausius, AE antoninianus. London mint. 

IMP CARAVSIVS PF AVG, radiate, draped, cuirassed bust right.
PAX AVG, Pax standing left holding branch and vertical sceptre. 
L in left field. 
Mintmark ML

RIC V-2, London 101. 

with permission of cngcoins.com, 2005.