This was a gift from Cinemaware back in 1989. I was involved with the creation of a game (The Kristal), that Cinemaware distributed in the US.
It was worn less than 3 times (I only remember wearing it once) - it was, and is, too small for me. Therefore it is in perfect condition.
I can not see a mark on it. It is made from a shiny silk like material. I hope the photos show this. It is so unused in fact that I only just noticed it has a pocket on the sleeve when taking these photos.
There is an old photo of some Cinemaware staff wearing the jacket here.