This looks like an ATA or a recast of it for me, so quite a good helmet. However, the handpainting is a disaster and will need to be completely re-done anew, the ears seem riveted instead of screwed so rivets will need to be drilled and replaced, and the neck trim hasn't the correct "s" shape.
Depending on the price it might worth to consider buying it, but there's work involve in it if you want to make it approvable. You may be better to buy a new kit to begin with.
Edit: Looking at the inside pic again, i really don't know how the ears are fastened. Maybe glued...?