Ok, I just thought I would share what I have found so far on the 945-1's in 3.75".
With the help of a member on another forum, I have determined that none of the 945-1's in 3.75" barrels have the model number stamped on the outside of the frame.
It might be that Smith and Wesson stamped the frame under one of the grips or on the inside. Not sure.
I am planning on contacting Smith and Wesson next week on this.
A fellow member on another board bought a 945 at a dealer in 2003 and it was apparently a 945-1. Serial number begins with RS which matches the serialization information I have that RSR Wholesale bought the run of stainless/alloy silver 945-1's.
Camfour bought the black ones with serial number CMFxxxx
There were only 2 runs of these guns. One run for Camfour in black and one run for RSR Wholesale in stainless/silver.
Product codes 170156 and 170169.
So, it is my opinion, because I now know of 2 people that bought these right from a dealer, that all of these firearms are 945-1's and are legal in the state of California.
Next week, I will call Smith and Wesson and ask them about this to confirm.