The Joslyn Art Museum in Omaha, Nebraska, announced that a painting that had been relegated to storage for a decade has been authenticated as a work by Rembrandt. The canvas, which has been in the museum’s collection for 72 years, was previously attributed to “The Circle of Rembrandt.” A recent reassessment by Rembrandt expert Ernst van de Wetering proved that the painting was made by the Dutch master himself.

“Portrait of Dirck van Os” was purchased by the Joslyn Art Museum in 1942 from a private collection as an authentic Rembrandt. A later assessment saw the painting reclassified as a work by one of Rembrandt’s students. After a visit to the Joslyn Art Museum in 2010, Van de Wetering had the work sent to Amsterdam for restoration. After later additions of paint were removed, a very different portrait was revealed, leading the scholar to deem the work a late painting by Rembrandt.

There are approximately 300 Rembrandts known to exist. “Portrait of Dirck van Os” will go on view at the Joslyn Art Museum in May.