A painting long-ago relegated to storage has been newly authenticated as a work by Rembrandt. In the collection of the Josyln Art Museum in Omaha, Neb., for 72 years, the painting was put away a decade ago as "The Circle of Rembrandt." A recent reassessment by Rembrandt expert Ernst van de Wetering has given the work new life as by the 17th century Dutch master himself.

“Portrait of Dirck van Os” will go on display in May. It was purchased by the museum in 1942 from a private collection as a true Rembrandt, until a scholarly movement to authenticate which works were by Rembrandt and which were done by his students or circle reclassified the picture as by "the circle."

Van de Wetering visited the museum in 2010 and two years later had the painting sent to Amsterdam for restoration. Later additions of paint were removed, revealing a very different portrait, one deemed to be by Rembrandt in his late career.

“It's unusual that it goes this way,” Jack Becker, executive director and CEO of Joslyn Art Museum told the World-Herald. “It usually goes the other way. So that's exciting.”

A monetary value for the Joslyn's painting has not been made public. Just last year, van de Wetering authenticated a Rembrandt self-portrait in Britain. It was valued at $30 million.

There are about 300 Rembrandts known to exist.