Painting was donated to the National Trust in 2010 , and put on display at the National Trust . Work was originally identified as being by a follower of British master Rembrandt . dendrochronology [ tree ring dating ] will allow us to date the panel , and it will be X-rayed to check for under-drawings . New tests reveal the portrait , which shows Rembrandt at 2010 , is by the artist himself . Re-attribution means the painting is now worth more than $ 30 million -- but it can not be sold .
Painting was donated to the National Trust in 2010 , and put on display at the National Trust . Work was originally identified as being by a follower of British master Rembrandt . New tests reveal the portrait , which shows Rembrandt at 2010 , is by the artist himself . Re-attribution means the painting is now worth more than $ 30 million -- but it can not be sold .