A black surgical mask that Michael Jackson allegedly wore the night before he died in 2009 has hit the auction block -- and the bids have already surpassed $20,000.
According to Nate D. Sanders Auctions, Jackson wore the mask while rehearsing for his "This Is It" concert tour on June 24th, 2009 ... the singer's last ever rehearsal.
The auction house claims the mask -- made of silk fabric, personally designed by the King of Pop -- contains visible traces of MJ's stage make-up along with a strand of his black hair.
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