Thanks everyone for the replies/info. Jai, where did you glean that number from? Gone back and scoured the photos, and re-scoured. Not seeing it! All very interesting stuff, even if its not what it was cracked up to be!

Have come into possession of what I am told by the prior owner is a "pre series 1 prototype" that was part of a run of only 48 made with an 80inch wheelbase. I don't really know what these numbers mean, or if the 48 number, or the 80inch wheelbase, or its prototype status is really true, or...