Texan Ray Riley picked up a painting priced at $90 at his local thrift shop. When he later examined it out the frame, Riley found a signature -- Sigmar Polke, an artist whose work reached a record $27.1 million at auction in June.

Riley is a regular browser at The Guild Shop in Houston and in the hope that he scored with his latest discovery, he contacted an appraiser. The image will be examined and if found to be an original Polke, it could be worth $2-7 million, says Riley. He plans to sell the work after it is authenticated.

“People come here to find the treasures in our shop,” The Guild Shop executive director Gaye Jackson told ABC News. “We have hundreds of art pieces that come through all the time and we obviously don’t know if some of them are worth millions.”