A lithograph bought for $12.34 at a Goodwill store in Milwaukee has turned out to be an Alexander Calder piece worth $9,000, the Associated Press reported.
More from GlobalPost: Renoir painting bought at US flea market
Karen Mallet, a media relations specialist for Georgetown University, bought the black and white print in May because she noticed it had a Calder signature. "I thought, I don't know if it's real or not but it's $12.99. I've wasted more on worse things," she told the AP.
Calder is an American artist active from 1923 to 1976 who’s best known for his kinetic sculptures. The print, made in 1969, is No. 55 of 75 lithographs entitled “Red Nose.”
Finding valuable artworks at thrift stores “happens very frequently — you can't imagine," Jane Jacob, owner of Jacob Fine Art Inc. in suburban Chicago, told the AP. "They don't know what they have. They're just not set up to understand art history."
When Goodwill staff do spot important pieces of art among donations, the organization sells them at auction, the AP reported. Just last month, Goodwill auctioned off a Salvador Dali etching that was donated in Takoma, Wash., for $21,005, CNN reported.
The charitable organization’s biggest find so far has been a Frank Weston Benson oil painting in Portland, Ore., that sold for $165,002 in 2006, according to the AP.
More from GlobalPost: South African art heist: Police recover paintings stolen from Pretoria Art Museum
The World is an independent newsroom. We’re not funded by billionaires; instead, we rely on readers and listeners like you. As a listener, you’re a crucial part of our team and our global community. Your support is vital to running our nonprofit newsroom, and we can’t do this work without you. Will you support The World with a gift today? Donations made between now and Dec. 31 will be matched 1:1. Thanks for investing in our work!