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 the auction house -- Nate D. Sanders Auctions -- MJ wore the mask (above) 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.
One of MJ's former bodyguards was in possession of the mask, and swears by its authenticity. MJ famously wore surgical masks outdoors as a form of disguise.
The auction ends April 30th -- and bidding has already reached $21,190. The auction house estimates the mask will sell for $50,000-$150,000.
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