Ehm, Sig was responsible for the production of some Swiss Parabellum parts, including the frame.
Mauser did not get production tooling, but a number of jigs, design drawings and quality control tools and some sample guns. They basically had to reinvent the wheel. I know who bought one set of QQ guages, I was there when they were rediscovered
About the change to 9mm: If the 7,65 was so good (which it was, actually), then why did the Swiss experiment with 9mm rounds in the 1940s and why did they opt for a 9mm follow-up of the Parabellum in 1949? Since SIG was an important Parabellum subcontractor, it's interesting to say the least that they were involved in the P210 as well... Which interestingly enough wasn't a SIG design either.
Still have lots of data to analyze and there are lots of questions waiting to be answered. It came as quite a surprise that the research that went into Mauser's redevelopment of the Parabellum also uncovered some interesting Swiss info as well. I guess the next logical step is to start some experimenting with 06/29 pistols...
Any idea where the W+F archives went after they closed down?