Four months earlier Kirchherr had accompanied Paul, George and Ringo Starr on holiday to Tenerife and took some intimate photographs of the band.
In the letter that is now up for sale for £20,000, Harrison asked her to send him the photos so he could use them in his book.
He also included a tongue-in-cheek pic of his new Jaguar while lamenting his lifestyle.
He penned the six-page letter while staying at the Palace Court Hotel in Bournemouth, Dorset, where the Beatles were on a six-night residency of the town’s Gaumont Theatre.
Harrison complained that he was feeling run down and how his ‘balls have been aching…banging around on stage!’