We have a 1995 Jaguar XJS 4 door Sadan
special order. Purchase from original owner,
cannot find anything on this. Was told only
2 were built
Sounds fishy. You should require the owner to provide documentation in order to verify his claim. The burden of proof is on the seller.
XJS cars in 1995 were coupes or convertibles The car in normal production would be an XJ6. or an XJR (supercharged).