A series of artworks produced behind bars by the notorious Kray twins are expected to fetch £15,000 when they go under the hammer next month.
The series of paintings and drawing by gangster brothers Ronnie and Reggie were all produced while the pair served life in prison.
The series of pictures are produced by both brothers in a variety of mediums, including watercolour, chalk, charcoal, pastel, pencil, and on canvas - and cover a wide range of topics, including nudes, still life, and landscapes.
A spokesperson from auctioneers James and Sons said: "All 42 pieces in the collection were produced while the brothers were in prison - although some are clearly copies of original works by renowned artists, presumably from text books available in the prison libraries.
"While the work can best be described as naive it cannot be written off as pure amateurism - there is evidence of some talent.
"It's difficult to know how much these print are worth, as some people will pay a lot of money for them - but at a conservative estimate, we expect the collection to sell for at least £15,000.
"One album contains photographs and Reggie's letters to 'Clive', a fellow inmate who appears to have been Kray's 'gopher' at HMP Wayland and who kept in touch with him after his own release.
"Clearly his kindness was greatly appreciated and he received gifts of various items over a long period.
"These include a pair of boxing gloves which belonged to Charles Bronson which are also in the collection. These bear Bronson's name and are the subject of one of Reggie's letters to 'Clive', in which he describes how meeting Bronson was 'the most frightening visit I had' when the two, accompanied twenty prison officers, exchanged the gloves at HMP Parkhurst."
James and Sons will auction the collection on 11 July at Fakenham Racecourse.