[En Sabah Nerd]

Honestly with such a limited source of information this could be anything. It doesn't resemble any of the produced Violator figures so there is that, but then it could still have been a scrapped design. I'd maybe lean towards calling it a knock off or bootleg though since there's no way to 100% verify its origin and it not particularly resembling any actual Violator figure doesn't give it any credit. Regardless of its origin, be it a legitimate prototype test mold or a knock off, I'd highly doubt it holding any value if that's a concern since the original Spawn toys are hardly worth their original value today so a prototype of an unmade Violator toy would only be worth as much as a MoC series 1 Violator which is to say not a lot. It looks neat though so there is that.

Also, welcome to the Ark.