SIG was no subcontractor here and all the 06/29 producing tools/machines went to Mauser during the 60/70's so they were able to produce their own commemorative model(s).
The less production steps the cheaper the product, that is what the idea behind it was and FYI most of the 06/29 tools, gauges, production machines etc. were bought from Mauser quite recently by a Dutch collector that lives in Belgium...
The 7.65 was more accurate as the 9mm that is why the Swiss never made the change, stopping power was not that important to them.
Guisan.
