Carausius, AE antoninianus, London mint.

IMP CARAVSIVS P AVG, radiate, draped, cuirassed bust right.
PAX AVG, Pax standing left, holding olive branch and transverse sceptre. No field- or mintmarks.

Bicester hoard 1 (this coin); RIC V-2, London 119 var (obv. 
legend, no mint- or fieldmarks). Rare.