You are... not wrong, .
The painting, titled St Bartholomew, is by Rembrandt, and was completed in 1661. I came across it in an art book recently and it jumped out 1) because of its utter secular texture (no religious hints of any kind in the painting, no halo, etc) and 2) because of how utterly Impressionist it looks. For all intents and purposes, this could have been painted by one of the late 19th century French Impressionists, I thought. Look at the lines around the face! Amazing.
Some early Impressionist/post-Impressionist portraits below, to compare: