OK It is a copy, made by building one based on my model and not from a real prop.
You see the detailing like the triangle detailing on back was painted, and done with masking tape. I ADDED plastic layers so I could paint them easier and so that we would always know what was a real prop and what was my version.
The Klingon writing was decals, not raised letters like I did NOR engravings.
The squares markings were tape, not raised plastic out lines.
So it does have many minor things different, so it was not even a recasting…which as mine was take from a real original film prop would have much of the detail correct.
Also on the original the bottom fins were part of the main body, I took them off because of two problems, they were hell to cast and so many were broken in handling I made then replaceable.