I've come a bit closer looking for Boot or Gambler knives, but still nothing to match the image from the scene.
At this point I'm getting annoyed, I think I've looked at every picture of a knife on the internet..
Though not the closest in appearance I've found, the closest "production" facsimile I can suggest is a Rough Rider -
http://www.roughriderknives.com/small-boot-knife-checkered-wood-handle/ (which seems to be a copy of an older Camillus design, which may or may not be easy enough to find)
Still not the same thing, and now I just want to find the damn thing! - unfortunately, not too many 90s catalogues have been uploaded....