Rembrandt Swagger in Pasadena
Fabritius is on the verge of being the next Dutch Baroque rock star. He died young, at 32 (same age as Keith Moon). Fabritius is lately best known for The Goldfinch, a painting that inspired a novel and sent lines around the block when shown at the Frick in 2013.
In 2010 the Rembrandt Research Project recanted, restoring the Simon painting to the Rembrandt canon. It concluded that the NSM portrait's face had suffered "disfigurations resulting from the painting's turbulent history" but that "the style and quality" were characteristic of autograph Rembrandts. The calligraphic brushwork in the background was held to be especially diagnostic, unlikely to be copied too closely by someone else. (Fabritius favored lighter backgrounds, more clearly representing a textured wall.) The Project proposed that Rembrandt started the Simon painting but that capable other(s) completed it and/or restored it after damage to the face.
I guess that means it's as good a Rembrandt as the Polish Rider is, and better than the Salvator Mundi is a Leonardo.
(Below, Rembrandt's 1630 postage-stamp-sized Self-Portrait in a Cap, Open Mouthed.)