A Sgt. Pepper Hofner bass guitar, signed by Sir Paul McCartney himself, has been put up for auction.

The left-handed bass is a Hofner Violin Bass, the style Paul McCartney has played throughout his career. The guitar’s body is finished with a print of the Sgt Pepper’s Lonely Hearts Club Band album cover. The white pickguard features the autograph prominently, and the guitar comes with a certificate of authenticity from ACOA.

At the time of writing, the highest bid is $15,500, with 32 bids in total. The proceeds of the auction will go towards Beyond Freedom, a nonprofit that helps victims of sex trafficking rebuild their lives.

The auction ends 23 October, at 3:09pm Eastern Time.

Bid on the bass guitar here, and find out more about Beyond Freedom here. For more music news, click here