Syd Barrett's nephew is auctioning off an acoustic guitar the Pink Floyd member entrusted to a brother at about the time Barrett quit the band. Proceeds from the sale of the rare collectible which is expected to bring a top bid approaching $20,000 during the auction held by Cheffins on Thursday (10/28) will be shared with a mental health charity and a hospice organization. Barrett included a passing reference to the Yamaha guitar during an interview with Rolling Stone Magazine in 1971, saying, "It's my new 12 string guitar. I'm just getting used to it. I polished it yesterday." A copy of the issue with the interview will go along with the instrument to its new owner.