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cubuffs.com says, "1934?The school nickname and mascot is officially designated “Buffaloes.” The Silver & Gold newspaper sponsored a contest, as the school had no steadfast nickname or symbol; other newspapers at the time picked up the story and entries were coming in from all over the nation. Teams were often called the Silver and Gold, Silver Helmets, Yellow Jackets, Hornets, Arapahoes, Big Horns, Grizzlies and Frontiersmen."
Right now we use "Silver and Gold" prior to 1934 and "Bufaloes" from 1934 onwards. So some years prior to 1934 might be incorrect. UW Dawgs (talk) 15:16, 8 September 2016 (UTC)
This cubuffs.com article states "That 1923 season, which saw the Colorado 11 (CU wouldn't go by the name "Buffaloes" until the 1934 season) go 9-0-0, created a movement on campus to build a new stadium to replace Gamble Field, which had been CU's first on-campus athletic field." This is more implication that "Silver and Black" was informal and there was no official nickname. UW Dawgs (talk) 19:50, 13 September 2016 (UTC)