3.5" with black cardboard reverse having large sticker from maker Los Angeles Stamp & Stationery Co. Reverse has horizontal bar pin. Front shows rear view of man on a donkey and as a rebus the text reads "I Saved My Gas, And Rode My (Ass) To Western Fairs 1944 Convention." This group was founded in 1922 as a trade association to promote the fair industry in the western United States and Canada. The group remains in business today serving more than 800 members. Button is Exc. and displays Mint. Only example we've seen.