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 The fight over tragic Nirvana frontman Kurt Cobain’s most priceless guitar is heading for a bitter, multimillion-dollar court battle. 
 
 Cobain’s daughter with Courtney Love, Frances Bean Cobain, has been trying to get the instrument — which her father played in Nirvana’s seminal 1993 “MTV Unplugged” concert — back from her estranged husband, Isaiah Silva, ever since they split in March 2016. 
 
 Silva, a musician in the band the Eeries, claims that in happier times, Frances Bean gave him the guitar — a Martin D-18E with the bridge flipped so that Kurt could play it left-handed — as a wedding present when they secretly married in 2014. It was once insured for $1 million, but experts say it is now likely worth several times that amount. 
 
 Frances Bean, who was not yet 2 years old when her father committed suicide in 1994, denies that she gifted it to Silva. 
 
 Love has said of the guitar — believed to be the last Kurt played before his death — “It’s not [Silva’s]. It’s a treasured heirloom of the family. It’s not his to take.” 
 
 The guitar is so valuable that Love’s manager has even allegedly sent a string of threatening messages to Silva’s ex-girlfriend in an attempt to get him to hand the historic instrument over. We’re told that after months of negotiation, Silva is still holding out and — according to Frances Bean’s side — is taking “extreme and unsupportable positions” on the disagreement. 
 
 “He is forcing the matter to litigation,” we’re told. Meanwhile, sources close to the struggle say it ended in a deadlock, and Frances Bean is ready to take the matter in front of a judge. 
 
 An insider tells us, “In September, a judge ordered Frances Bean to pay Silva $15,000 a month in spousal support as part of an interim settlement while they worked out the guitar issue through mediation.” 
 
 Reps for an attorney for Silva didn’t get back to us. ||||| Frances Bean Cobain Hubby Wants FAT Allowance You Left Me Broke! 
 
 Frances Bean Cobain's Hubby Wants FAT Allowance 
 
 EXCLUSIVE 
 
 Frances Bean Cobain's estranged husband says he won't have a penny to his name without her ... so he's asking a judge to make her pay up. 
 
 Isaiah Silva is requesting spousal support, and according to the docs he wants a ton of it -- nothing less than $25k a month. 
 
 Isaiah says he left a steady job when they got married and Frances promised to cover a bunch of his monthly expenses, including paying private school and housing bills for his child from a previous relationship. 
 
 Now, he says Frances wants to renege on those commitments. Isaiah claims Frances has upwards of $100 mil in her dad's estate, and says he deserves half of the money she earned off business deals made during the 2 year marriage. He says there's no prenup. 
 
 Frances made it clear in her divorce docs ... the Kurt Cobain money is hers alone and not Isaiah's -- but she is open to paying some spousal support.
– A guitar that once belonged to Kurt Cobain, which is likely worth millions, is now in the hands of Eeries frontman Isaiah Silva, and Cobain's daughter is fighting to get it back in the family. Frances Bean Cobain was married to Silva for 21 months, and she's been trying to get the Martin D-18E (which had the bridge flipped so Cobain, a leftie, could play it comfortably) back ever since they split in March. Silva claims she gave it to him as a wedding gift and it's rightfully his. Now, the battle is headed to court, Page Six reports. "It’s not [Silva’s]. It’s a treasured heirloom of the family. It’s not his to take," Frances Cobain has said. But sources tell Page Six that Silva isn't giving in, and "is forcing the matter to litigation." The guitar, the one Cobain played during Nirvana's 1993 MTV Unplugged show and also thought to be the last one he played before taking his life, was once insured for $1 million but, per experts, is probably worth several times that now. Back in August, Silva requested $25,000 a month in spousal support and half of any money Frances made during the marriage, and said the couple had no prenup, TMZ reported. A judge has since ordered Frances Cobain to pay Silva $15,000 a month as part of an interim settlement.