Gallienus, AE antoninianus. Joint reign. Milan. AD 259. 

IMP GALLIENUS P AVG, radiate head right.
PM TRP VII COS, emperor, veiled, seated left, holding globe and baton. 

Mintmark MS. 

RIC V-1 (J) Milan 311; Goebl 1340d; Cunetio hoard 1746; Sear -.

Image courtesy of the Dalheim hoard catalogue.