John,
* Per Jan Still, Imperial Luger, Pg. 62, there were approximately 175,000 Erfurt produced in 1918. The S/N range is 304 to 7538t as of this books 1991 release date. Lugers were made in blocks of 10,000 pistols. The small cursive lower case letter indicates which block of 10,000. For 1918 Erfurts, a number of S/N blocks have not had a surviving pistol yet reported; hence, the estimate of 175k.
* Crown/RC is the acceptance stamp of the Revision Commission. This indicates a servicable Luger that has failed the stringent Army Inspection because a non-critical tolerance or external deviation. The C/RC stamp approved the Luger for service and absolved the Army inspector from blame if the Luger failed.
* Looking forward to seeing pics when you can accommodate.
Respectfully,
Bob
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