Went to look at a pre owned 2018 Tesla S 75D, 3500 miles and right beside it was a 2016 model X 75D Founders Edition with 23,000 miles. Color was Midnight Silver with black interior and not a scratch or chip on the entire vehicle. Dealer has ordered a set of new tires for it and it drove great. I had never heard of a Founders Edition, but inscribed on the back and sides was the inscription. Any thoughts? The X was 6 grand more than the S.