The Gemäldegalerie in Berlin has around 17 Rembrandt paintings — “around” because paintings do get reclassified. The Man with the Golden Helmet was long considered one of the best examples of a Rembrandt painting, but further research led to its reclassification to the Rembrandt Circle. Similarly, the Self-Portrait with a Velvet Beret and Iron Collar is now considered a painting of Rembrandt by someone in his circle (and just maybe Rembrandt painted at least some of it himself).