Irregular Antoninianus of Carausius

Irregular Antoninianus of Carausius AD 287 to 93 Radiate,draped & cuirassed bust of good style right. part of radiate crown missing due to lamination of the flan. (IMP CAR)AVSIVS PF AVG Rev:- Britannia (?) stg left presenting standard to Emperor Legend :- illegible (II ...........T.S) ?? Type similar to RIC Vol V Pt 2 Nos 771/72 Unattributed Coins