John Lennon Authentic Lock of Hair from filming 'How I Won the War'John Lennon Full Lock of Hair from the preparation for filming How I Won the War in 1967 Provenance This is a lock of John Lennon's hair trimmed in September 1966 in preparation for filming How I Won the War, along with a photocopy of Lennon's signed call sheet and certificate of authenticity from Heritage Auctions. It was originally obtained directly from John Lennon's hairdresser Klaus Baruck, who trimmed Lennon's famous hair in Hamburg, Germany,