Steve,
Actually, I agree with you that the receiver is a replacement. The serial number of the frame is only roughly 1000 away from the start of Model 1906 production placing its manufacture no later than late 1906/early 1907, whereas the receiver was most certainly produced in 1912. However, I am still of the opinion that the barrel and receiver were originally proofed in Germany and not sent back at a later date. Possibly it was an OEM part from DWM ordered by the workshop that did the rework.
I am leaping to the conclusion that it started life as one of the small lot of 1906 Swiss Commercials based on its final Swiss configuration. It could very well be an early standard 1906 Commercial that was “transformed” into a Swiss when it was reworked. At any rate, it is an early 1906 and a very interesting piece. I would have it in my collection based upon its condition, markings and as a stimulus for interesting conversations!
