Dwight, Underside of the bbl. has only the serial number no suffix. On the right side are the same four proof marks as my 1917 military that is number 69 no suffix. What exactly is an alphabet Luger? I do have another commercial, 5176n, .30 cal. hidden numbers, Germany on rt. receiver and magazine bottom, 3.75 bbl. crown n lt. receiver. I always called it a 20 commercial........Fleming
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