A flea market find may mean a big payout for a Texas man. Ray Riley believes that the canvas he picked up for a mere $90 earlier this year is an authentic Sigmar Polke painting.

Polke has had a resurgence over the past few years, with a retrospective of his work at MoMA this past year and a new record for his work set at auction in May this year when it sold for $27.1 million at Sotheby's New York (prior to that, the record was $9.2 million, set in 2011).