The Crown/N on the breechblock and the 7.65mm caliber pretty much indicate a 1920s Commercial. There is no proof on the left receiver and it may have been removed during refinish. Without the serial number and a photo of the bottom of the barrel there is not much more that can be said about model identification.
The grips look Mexican, although they are not a typical design. In Juarez in the 1960s almost every shop had real sterling silver grips with gold overlays for Colt and S&W revolvers, .45 Autos (the most popular!) and Lugers. They were made by the silversmiths in Taxco and were of very nice quality and workmanship (but a bit gaudy for my taste
). There were still a lot of them around during the 1970s and they were not expensive. I kind of wish I had picked up a pair. Today the silver alone would be worth several times their cost back then.
The only “Mexican” grip Luger I own I found in a pawn shop in El Paso. It had ridden around on the hip of a Juarez policeman for a number of years and has a gold national emblem inset on both grips (this side is the larger of the two).