Crispus coins with SOLI INVICTO reverses are fairly rare and I just got this nice example-
Crispus
A.D. 317
20x21mm 3.3gm
CRISPVS NOB CAES, laureate and cuirassed bust right.
SOLI INVICTO COMITI, Sol standing left, chlamys across left shoulder, holding globe in left hand, raising right hand; S-P in fields.
In ex. PLN
RIC VII London 115