The Gretsch 6120 is a hollow body electric guitar with f-holes, manufactured by Gretsch and first appearing in the mid-1950s with the endorsement of Chet Atkins. It was quickly adopted by rockabilly artist Eddie Cochran, Duane Eddy, Eric Clapton, Brian Setzer and many others. Pete Townshend got one as a gift from Joe Walsh in 1970, which he later would use on recordings for Who's Next and Quadrophenia.
After George Harrison played Gretsch Country Gentleman and Tennessean models (which, like the 6120, were developed with and endorsed by Chet Atkins) Gretsch found they could scarcely keep up with demand.
Read more about Gretsch 6120: Production History, Variants