I guess the other thing that we have to remember is that parts wore and were switched out...especially when some of these bike were used for generations. Eaton`s not only had a couple lines of bikes, but also a full line of components and accessories available through the catalog, including replacement forks, wheels, rims, saddles, sprockets...the works! The bikes were pretty standardized, and stayed that way a loooong time! I know I`ve found lots of bikes over the years with parts changed literally decades later....