Carausius, AR denarius, 17.5 mm, 4.74 g. AD 287-293.
London mint. 

IMP CARAVSIVS PF AG, laureate, draped and cuirassed bust right.
MONETA AVG, Moneta standing left, holding scales and cornucopiae. 

Mintmark RSR.

Unpublished. Not in RIC, Webb, Stukely, Cohen, Belfort, 
Schodt, Shiel, Akerman etc. cf RIC V-2, uncertain British mint 717 with no mintmark. 
Timeline Auctions, int. no. 100620, Dec. 2017.

Found near Romford, Essex, UK, 2017