Dave
Sounds like you have made quite a find and you are really on to something big! If indeed the full serial number of your Swiss is only two digits, it is very early. Herb, Joe and Tom provided you with excellent information except the very early Lugers did have the last two digits of the serial number stamped on the right side of the magazine release. There is another feature you might look for. Early Swiss also had what is called a "flat button" magazine. The button on the magazine used for loading has a very low profile and the opening in the grip was only large enough to clear this button. In a short time, this button was enlarged to make it easier to grasp and the frame was relieved to accommodate this higher button. Most early Lugers were later modified to relieve the frame for the larger button, so it is very uncommon to find an unrelieved frame.
