This Constantine II campgate has an unusual design in the center panel of each door. Perhaps it is meant to be the door handles.
below is the seller's info--
Centenionalis 325 â€" 326 frappé à Arles sous le règne de son père Constantin I (306 â€" 337) : 3,09 grammes ; 19 mm de diamètre.
A/ CONSTANTINVS IVN NOB C buste lauré drapé et cuirassé de Constantin II à gauche.
R/ VIRTVS CAESS / TA croissant RL. (la vertu des Césars) Porte de camp pourvue de battants ouverte surmontée de quatre tourelles ; au dessus, une étoile.
Cohen 239, Ferrando 697. RARE.
I have a similar one. I also thought it was doorhandles or even cornucopias. Interesting to see there is another mintmark with the variety.
Constantine I 329AD
Laureate, bust right, CONSTAN-TINVS AVG
Campgate, 6 layers, 4 turrets, star? doors open, 3 panelled with dots and door handles, VIRTV-S AVGG
SA dot in crescent RL?
RIC VII Arles var, R5
20mm, 2.47g
here is another example
Constantine I
A.D. 325- 6
19mm 3.2gm
CONSTAN-TINVS AVG, laureate head
VIRTV-S AVGG, campgate with wide open doors, four turrets, star above.
In ex. SA crescent RL
RIC VII Arles 291