Yeah, I'm with Lou on this one. I've seen jacks like mine go for hundreds on Ebay, I suspect it's the fact that there were similar ones used on Jags that drives the prices up. Original tool rolls are the same, lousy screwdrivers that you'd throw away and replace with a proper one but people are paying well over the odds just to have the original look.
If you want the later scissor type then I'd do what Lou suggests, buy a modern one, strip it down, weld on the custom parts, paint it in something like the OEM colours and then leave it outside in the rain for a month or so to collect "patina"
Brian
(clearly not your average concours participant.....)