Dwight,
Here are some additional photos, this time taken with a scanner and with some more precision.
I don't think this a 'rare' Luger but anyways I would be interested to know some of the history of this pistol. I'm not sure if this gun is of Finnish origins maybe the seller bought it from somewhere in Europe because he mentioned he travels a lot. He had 8 Lugers to sell, all where model 23 commercials according to him. However this is actually a 20 commercial?
Thank you kindly for your help in identifying!