This is a fairly new engine for modelers. It is a 1/3 scale of a 1903 engine, manufactured by Cavanaugh Darley Gas and Gasoline Engine Company, Chicago, IL. This particular engine manufacturer was no longer heard of after 1904. Bob Banke in Oregon scaled this engine and now offers castings and CAD drawings. They are developing a web site at: www.shelfpetmodels.com