First seen 3" with paper sticker (stained by its self-adhesive) that reads in part "Courtesy Of The Carbonated Beverage Can Makers Committee." Curl has 1970 Hanna-Barbera copyright. Originally issued with copy of letter from Screen Gems executive addressed to "Dear Yogi Bear Licensee" explaining Yogi will be anti-litter spokesman on radio, TV, in-store and on billboards for 172 brands of carbonated drinks sold in cans. Letter gives ad executive name in charge of campaign and references this button "Prepared For Distribution At The Meeting Of The Members Of Carbonated Beverage Can Makers Committee." Letter VG. Button NM.