Lite Box:
That is indeed a nice example of an Aussie Pre-Victory Model. Vega imported a whole bunch of these in the 1990s.
Your estimate on the shipping date is, I think, a little bit off. It was most likely shipped a few months later, based on the information in the Victory Model Database.
As to the stocks, you are correct that the original stocks for your revolver were probably the smooth walnut variety. However, the changeover occurred later than January, 1942. If you ever decide to swap the stocks over to smooth walnut let me know as I may be able to help you with a pair.
If you want to get a factory letter you can do so for $30. Or, if you want to post here or email me the complete serial number and the markings on the left topstrap and butt, I can give you a very good estimate of the probable ship date and destination from the Victory Database.
Regards,
Charlie Flick
S&WCA #729
NRA Life Member