Jim,
* Right(40,0xx), Right(Oct. delivery),and as Dwight said: On the frame's vertical surface forward of the disassembly lever and also on the barrel where you detected it.
* Your hold-open likely was retrofitted into this pistol after it was issued by a May 6, 1913 Army Directive. The Royal Erfurt Arsenal did the work and marked (small crown over Fraktur Letter like Crown/P) the right side of the frame beneath the upper frame rail adjacent to the hold open retention pin. The exact/approximate date of retrofit is unknown.
* Even had product recalls back then; but, this was due to a Customer upgrade "request".
Respectfully,
Bob
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