Classic Tiffany anyone know anything about them? Value?

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I found an 86 Tiffany its a mecury chassis on ebay. Auction ended without meeting the reserve I emailed the guy a few times hes says they are worth 28k+ his buy it now was only 21k, hes gaurentees the car says he has to move it fast because hes losing the storage space thats why its so low. The pics are awesome it apears to be in great shape I cant find anything anywhere about these cars and would love to get it. Im hoping if I can find the info I need before he relists it so I can work a deal so please help, a forum, some place to get info on this car anything would help, I really cant afford the 21k right now, so I am praying I can work a deal but dont like going in blind, ive never seen one before hes says there was only 900 made?? its just an awesome car Ive got pics Id post to show you why Im in a rush but cant figure out how to post them but theres no info out there if someone could please help thanks