June 10 (UPI) -- A LeBron James rookie card stunned observers by selling online for $57,100 -- nearly $50,000 more than it sold for just four years earlier.
The card, which has a perfect-10 score from collectibles-rating company Beckett, sold for just $7,150 four years earlier.
Analysts said they were surprised by the card's swift and steep increase in value.
"I love reporting on cards and memorabilia, but sometimes I just have to step back and think 'how real could this be?'" tweeted Darren Rovell of betting website Action Network.