"It's absolutely the finest rock and roll artifact to survive the 20th century," Martin Gammon, a book and manuscript analyst at Bonhams & Butterfields, said Thursday
The lyric sheet, which was drafted in 1967, is estimated to sell for as high as $2 million at the auction. The music relic is currently on display at Bonhams San Francisco office until February 12.
The value of the manuscript has increased exponentially in a little more than a decade, Gammon said. An unidentified American collector purchased the lyrics for "A Day in the Life" for roughly $100,000 in 1992 — considerably less than the likely winning bid in 2006. They originally belonged to former Beatles road manager Mal Evans.