Pink Floyd fans will soon be offered the opportunity to own a unique — and no doubt pretty expensive — piece of the band's history.

Rolling Stone reports that a Recording Industry Association of America plaque, presented to certify one million copies sold of the band's watershed The Dark Side of the Moon LP, is on the auction block. Formerly owned by late Pink Floyd keyboardist Rick Wright, the plaque comes with a letter of authenticity written by Wright's widow Franka, who's quoted as saying, "I hope anyone that has any of Rick's items enjoys them as much as I do."

The sale is being hosted by Nate D. Sanders Auctions, with bidding set to conclude at 5PM PT on June 22. The auction, which you can watch or bid at Nate D. Sanders Auctions' website, has a starting bid set at $20,000.

Naturally, that starting bid seems all but certain to be eclipsed by a wide margin long before the auction ends. Wright's Dark Side award isn't the first piece of memorabilia to change hands in recent months, and it's clearly a seller's market: in March, the recording console used during sessions for the LP went to auction, and fetched $1.8 million — more than double the projected winning bid.

Whatever the plaque ends up selling for, it'll doubtless be more than most fans can afford, but whoever wins the auction can rest assured they're making an investment that should only continue to appreciate over time. As the Sanders site notes, Wright's platinum award for Pink Floyd's The Wall LP was auctioned off in 2005, and brought in "over $40,000."

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