Carausius nummus,
Die-axis: 1 o’clock
Weight: 2.99 grammes

Rotomagus

IMP C CARAVSIVS, laureate cuirassed bust

LAETITIA, Galley

mintmark OPA

Thank you British Museum for images and text https://www.britishmuseum.org/collection/object/C_1848-0426-5