Helmeted Crispus, help in attribution

I bought this helmeted Crispus, but I can not find the same variant on acsearch. Please help me in attribution, RIC number. I found only with PLN instead PLON in exergue.

Crispus. Caesar, AD 316-326. Æ Follis. Londinium (London) mint. Obv CRISPVS NOBILC, Helmeted and cuirassed bust right. Rev. VIRTVS EXERCIT, Two captives seated at base of vexillum. Weight 2.9 g.


Previously, I only had this one helmeted Crispus.
Crispus. Follis. Londinium. Obv: CRISPVS NOBIL C. Helmeted and cuirassed bust left. Rev: BEATA TRANQVILLITAS, PLON. Globe set on altar inscribed VOT/ IS / XX. RIC 211.


Post your helmeted Crispus, or anything you think is relevant.

 

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You can search here :http://www.coryssa.org/index.php/su...ndinium/view_type/rarity/period/roman_emperor

 

I like using OCRE for RIC online.
http://numismatics.org/ocre/results...Crispus"+AND+fulltext:Plon+AND+fulltext:Nobil

 

Thank you. Very helpfull.