2" with metal back and bar pin which is held in place by a small notched cut-out of the metal back. Button curl has name of Chicago maker Cruver. Farmall apparently originated in the 1920s but we can't find much in the way of a reference to a Tractioneer prior to 1957. However the manufacturing style of this button dates it to the 1930s. Very trivial surface wear only in reflected light. Exc. and displays Mint. Only example we've seen.