A toilet reportedly used by former Beatle John Lennon sold for $18,341 to an unnamed bidder at a Beatles convention held in Liverpool, organizers say.

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That's nearly 10 times what the porcelain pot was expected to bring, auction organizer Stephen Bailey told the BBC.

Lennon used the lavatory during three years he lived at Tittenhurst Park, Berkshire, between 1969 and 1972.

"It is unbelievable," Baily said after the sale. "We had bids coming in from all over the place but it went to a private overseas buyer."

The auction was part of the 33rd Beatles Convention in The Paul McCartney Auditorium at The Liverpool Institute for Performing Arts.

A harmonica once owned by Lennon's son, Julian, brought sold for nearly$5,000 -- more than twice auction estimates.

A copy of the album "Two Virgins," which Lennon recorded with wife Yoko Ono, garnered nearly $5,000 and an unused 1968 concert ticket for a Beatles performance aboard the Royal Iris ferry sold for more than $3,800.