Sixty-Fiver you are right about the 26" wheel/tire deal.
Without giving too much away the bike is a 1993 with the same stance as the early mtbs. After a little research the frame is actually a 18.5 but rounded up from what I could gather from other years. It has a flat top tube as well.

I have emailed the seller but no answer to date. I may decide to pass but I am having a hard time...It is very nice