Crispus, AE Follis, 321 AD. 19 mm, 2.89 g.

CRISPVS NOBIL C, helmeted and cuirassed bust left, holding spear pointing forwards, and shield on left arm.
BEATA TRANQVILLITAS, altar inscribed VOT-IS-XX, three stars above.
P-A across fields.
Mintmark PLON. 

RIC VII London 215.

Image courtesy of the Portable Antiquities Scheme, PAS 570952.
Found in Great Totham, Essex.