Mike, the rear toggle link pin that connects the toggle to the receiver should be numbered on the head of the pin on all Mauser built Lugers. When they left the factory, they were. Sometimes this link was field or armory replaced, if too much clearance was present. These replacement pins were numbered on the right side with the dimension in millimeters that it deviated from a nominal dimension. That is from 1934 (K-Date) to 1942.
If I were you I would look for a different local Luger Authority!!
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