Could also be a Barbarous Southern Gallic imitation like this one https://www.acsearch.info/search.html?id=7877810 Barbarous radiates are imitations of the Antoninianus issued during the Roman Empire, which are so named due to their crude style and prominent radiate crown worn by the emperor see http://augustuscoins.com/ed/imit/BarbarousRadiates.html
Good point. I feel like the beard on OPs coin points towards official. If unofficial it would be very high quality