Did it have a particularly stiff LE? I can't imagine it would work very well with a 12 foot two-wrap edge (but this is, as you know, a total newbie speaking) - wouldn't the flex of the LE be too much?
Have to say though, the 'stretched-out-normal-Rev' proportions look fantastic!
As Ben said, it was a prototype of the first Revolution on the market. This would be around 1987-88.
Joe told me some years before, that they had experimented with quite a number of different materials for spars. They finally ended up making carbon spars themselves, which they still do today.
With the long LE of this prototype, it obviously flexed probably a bit too much. That would be a reasonable reason for the shorter leading edge of the Neos Omega, later REV I that came on the market in January 1989.
They obviously achieved at that time, a robustness that no other manufacture had attained with stunt kites. I would not doubt that they can still lay claim to this today.