1 of 8 built? Could anyone help with a value on 91 XJS V12 show car

Hi folks, I'm brand new here and was hoping I might find someone(s) that might be able to help me out. My elderly aunt has a 1991 Jaguar XJS Coupe with V12 and is the original owner. She has finally surrendered to the idea that it is best to part with the car.

She purchased it new at a dealership in PA (name escapes me at the moment) and it has been garaged it's entire life.

Here is what I've been told by she and my Uncle:

According to the dealer, when they purchased it (new off the showroom floor), this was one of only eight like cars built for the Jaguar show circuit, they were told that the other seven were located on the west coast and this was the only one of them that was sent to the east coast.

It is bright red with tan leather interior with red piping on the seats. It also has a factory custom painted pin stripe (tan I think). It also has a very nice looking factory ground effects package with dual exhaust (& factory chrome splitters) encased within the rear valance, not above and around the exhaust like all others I see. They were told all of this was part of a special edition package this car received from Jaguar for the show circuit. It has polished wire wheels but Aunt Sally said she asked for those to be put on at the dealership as she liked the wires better than the stock rims. She recalls the rims alone were over $2,000.00 at the time.

I don't know what options it has specifically because I don't know what came standard, but it does have heated seats. It has a tag on the back that says Collector Classic - or something along those lines. The car is completely stock and never modified in any way, it has around 35K miles or so on it and is very clean overall.

Anyway, she lost her storage spot and is in need of something a little more practical for her at this point in life. She has finally agreed to sell her "little red car" - as she calls it.

I guess my main questions are: #1, does any of this 1 of 8 concept sound reasonable to anyone? And #2 what would something like this be worth roughly. She would obviously like to get what she can, but she also does not want to sit on it long.

I realize it is hard to put a value on something you can't see but hopefully some of you can help me out with some ideas. I am going tomorrow to pick it up and offered to store it at my house until it sells. I can then provide pics and whatever else. I will get the VIN number and post it as well.

It looks exactly as a car of this caliber should look, it's very shiny, no rust anywhere. Overall very well preserved. Sat in the garage most of the time. I do know the headliner is drooping some but otherwise I think it's a very good car.

Thanks for any help!

Guy - Trout Run PA