According to G&S, page 605, at about serial number 39100 of the '08 commercial series, they stopped stamping the last three digits of the serial number on the receiver stop lug and went to a new system. For a five digit serial number, the 2nd and 3rd digits were stamped on the receiver ring in front of the lug. The 4th and 5th digits were stamped on the lug. Thus the last four digits on the full serial number were on the receiver ring and lug.
The subject Luger should be stamped in that way. I also think Gunnertwo is correct that it was made about 1910 and Ron is correct that it's an early 1908 commercial..
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