Carausius, AE antoninianus. London mint. 

IMP CARAVSIVS PF AVG, radiate, draped and cuirassed bust right 
PAX AVG, Pax standing left holding branch and vertical sceptre. 
E-O across fields. Mintmark ML. 

RIC V-2, London 101

Courtesy of Jesus Vico S.A. Auction 135, lot 333, June 2013.