Magnentius from Rome -

[crispus]

Not common Magnentius from Rome

Magnentius, AE 23, Rome, 350
A/ IMP CAE MAGN-ENTIVS AVG, Draped and cuirassed bust right,
R/ VICTORIA AVG LIB ROMANOR, Victory and Libertas standing facing one another, holding palm frond and transverse scepter, respectively; trophy between
RS in exergue
RIC.192 R â€" Bastien « Le monnayage de Magnence » n°435 (1 ex), 2ème phase de février 350 à début mai 350

This type seems much more rare than indicated in RIC.

[Victor]

Yes, that is a type that does not turn up often.