Carausius AE antoninianus, uncertain mint. AD 286-297. 19 mm, 2.7 g. 

IMP CARAVSIVS AVG, radiate, draped and cuirassed bust right.
LITIA, Britannia standing right, holding trident, clasping hand of emperor standing left in military dress, holding spear.
Minkmark off flan, or none. 
Unpublished. Roma Numis. XIII, 1079.

With permission of Roma Numismatics Auction XIII, Lot 1080, March 2017.

This reverse type is listed in RIC, Webb, Evans, Akerman 
etc. as official and unofficial issues with 
various legends and mintmarks.