Hi, Peter,
I confess to being a "newbie" on some of the more exotic details of Lugers, but I was unaware that there was any difference in the receiver axle (rear toggle pin) between the early and late pistols. No parts list I have indicates that there is a difference or that the date of the pistol is needed when ordering.
FYI, the standard pin is .282" (7.16mm) in the shank, and .318" (7.88mm) across the head. If that one is larger, I suspect it may be a gunsmith job to replace a worn one, or maybe just the replacement of a lost pin with what was "on hand" and the hole drilled to match. FWIW, the one marked "42" clearly seems to fit, where the one marked "73" is undersize, at least at the head.
The numbering means nothing, of course. Any pin could have been numbered to match its pistol.
Jim
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