Though this coin is not listed in RIC; the footnote for Ticinum 135 mentions some examples and states "In a way, it would be natural to expect radiate heads for Crispus too, as all other rulers have parallel busts, one of which is radiate."
Crispus
A.D. 320
CRISPVS NOB CAES; radiate head right.
DOMINORVM NOSTRORVM CAESS surrounding wreath enclosing VOT ✶V
In ex. TT
cf. RIC VII Ticinum 135
No measurements given in the listing