1-7/8" litho designed like a baseball picturing and reading "'Gee' Walker Supercharger Club Member 1937." Pictured is Detroit Tigers slugger in his last year with the team. The club was sponsored by Graham-Paige Motor Cars with club name equated to "Supercharger" mechanism engineered for the car product. Button was originally issued with a club "pledge" as well as a 16-page booklet describing the virtues of the car. Button is a litho with covered metal back and bar pin. Probably the best condition example we've ever seen with exceptional high gloss and almost total absence of paint wear. Scarce and rare in this condition.