Los Angeles , California ( CNN ) -- A spokesman for the trustees who control Michael Jackson 's estate said designer belts produced under a contract with the pop icon 's parents were not authorized . Asked if there would be legal action to stop the marketing of the belts , estate spokesman Jim Bates said it was undecided . Another company , Bravado , has a contract with the estate to market Michael Jackson merchandise , Bates said . A representative of the company marketing the belt said Katherine Jackson , the late pop star 's mother , cleared the deal with the trustees . The sale has been put on hold while lawyers discuss a solution , he said . The crystal-encrusted belts , which went on sale through the designer 's website Wednesday , are intended to raise money for the Jackson family museum planned for Gary , Indiana , according to a family friend involved in the deal . The first belt produced -- known as the `` artist 's proof '' -- was autographed by Michael Jackson 's three children and his parents for a special auction set to start Thursday . Katherine Jackson and her grandchildren Prince , Paris and Blanket Jackson are the chief beneficiaries of the Michael Jackson estate . Charities yet to be chosen will also get 20 percent of the estate 's profits , according to the will signed by Jackson . Katherine Jackson dropped her challenge for control of her son 's estate in October , but her husband still has a legal objection pending in probate court . `` This is a truly one-of-a-kind opportunity , '' said Jerry Olivarez , the Jackson family friend who helped bring the deal together . `` I know of no other item that has ever been made available to the public that has been signed by both the parents and children of Michael Jackson . '' Blanket , whose real name is Prince Michael II , Paris and Prince Jackson each signed the artist proof belt at the Encino , California , home where they live with their grandmother . The youngest , who was born in 2002 , signed his name in true `` John Hancock '' style , taking up the most room with large block letters spelling `` BLANKET . '' Prince , 13 , helped his younger brother by adding `` Jackson '' below his first name . Paris , 12 , showed flair with her signature , using a heart to dot her `` i '' and giving her `` r '' a long , flowing branch . The leather belt was designed by Simon Tavassoli and a limited run of 7,000 are being handmade at his Newport Beach , California , studio . Each unsigned belt will retail for $ 1,500 , he said .
Estate spokesman says belt deal was not approved . Estate has n't decided if it will stop belt sale . Company marketing MJ belts says his mom got approval . `` Artist 's proof '' belt autographed by Jackson 's children , parents .