Chris,
Congratulations on the acquisition of your “first” Swiss (I suspect it won’t be your last
)…they are beautiful pieces of machinery.
The information you have about the 06/29 is correct, all of the changes were largely cosmetic and designed to reduce cost of manufacture. Functionally, there is no significant mechanical difference in design. Nearly all of the changes can be observed just by looking at the gun: completely rounded forward receiver; straight grip eliminating the swell or “Schnabel” at the bottom; grip safety that wraps completely around the grip strap (ostensibly this was to preclude objects from getting under the grip safety and rendering it inoperable) and the "tab" at the top of the safety that blocks the sear bar is simply rounded over rather than the more complex backward-slanting tab of the former design; and the elimination of the checkering on the metal parts. The non-visible change was the internal machining of the side plate which significantly simplified its production but did not alter how it functions.