Very unusual design from 1985.  Made in Colorado from 4130 cro-moly.  The frame is New Old Stock with all original parts on it including the optional rear rack.  The front wheel is a 24" and the rear is a 20" but the bottom bracket is at normal height.  Notice the chain roller to keep tension on the chain and the large "bash guard" under the bottom bracket.  Bicycling magazine did a large article on the Mountain Machine when they came out.  We have a copy of the article as well as a couple of pieces of original sales literature.  We also have two NOS frames and another bike built with modern parts.