Here is a Crispus AE3 Follis/Nummus which I think it's a bit scarce:
CRISPUS AE3 19mm 2.93g Follis/Nummus
AV: CRISPVS NOB CAES; laureate, cuirassed, spear pointing forwards, shield on left arm bust l.
REV: DOMINOR·NOSTROR·CAESS; VOT / · / X / crescent inside wreath.
EXE: ST, Ticinum mint.
REF: RIC VII Ticinum 171, rated R4 (rare) 322-325AD.
Rare bust type for the series.
I have seen another 6 or 7 specs but this bust type tends to be infrequent for this type.
A rare one and in nice condition
It was also a real bargain as it apparently flew beneath the radar.