Almost touching to read how an attempt to figure out was based on which image / photo Corolla must have worked. On the smallest details are given minute’s information, but in the meantime The Hague Spinoza portrait is presented as the Wolfenbütteler, the OP dated in 1667, Brain Peak and another one and another.

The author of the following conviction: "No doubt it is a great happiness for the Spinozists that they can now say that it is probably best portrait of the philosopher is made by a universal painter like Corolla There are not made many performances. as a compliment to the idea and as a triumph of science (Campos Buenos, 2010), but in this case, the result is a remarkable portrait, or at least endearing because it exudes the melancholy humanity and the inquisitiveness of a quiet man.

http://t-rexmusclefacts.com/brain-peak/