Carausius, AR denarius, Uncertain British mint. AD 286-293. 17 mm, 3.23 g. 

IMP CARAVSIVS PF AVG, laureate, draped and cuirassed bust right.
EXPE..., Britannia standing right, holding wreath, 
clasping hands with Emperor, standing left; altar 
between them. 
No mintmark. 

RIC -; RSC 36 (this coin); Shiel (Mint 2) 9 (this coin)
Very rare. Rated R4.

With permission of cngcoins.com, Triton XIV, Jan. 2011.