Might it be official rather than barbarous? Most barbarous radiates are a lot smaller than 19.5mm and the official ones could be pretty terrible. It is, though, a late 3rd century radiate, being copper rather than silver, and very likely Gallic (Tetricus etc).
The style is clearly unofficial in my opinion. The module of the 'barbarous radiates' began as more or less equal to the official coins but rapidly declined. The figure on reverse appears to be Virtus.
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