Actually it doesn't have any rust at all on it anywhere and its well greased. I do agree, a thorough cleaning and re-paint will make it look like new. Where ever it came from, its had a good home. I'll post a picture of it when I have it fettled.
Luck would have it that I was nosing about when the flatback that it was on, unloaded next to me. So having spotted it, I grabbed it and the scrapyard owner just looked at me and said a fiver...
One thing that I have noticed though, is that apart from the embossed lettering on the casting its Identical to my Record 4" engineers vice only 3 inch jaws instead of four, even down to the blue colour of the paint.