Shel,
I use the catalogs (AKA "Randall Software") to help recreate the history. Early on, I bought the "Intersquare CD" containing most of the catalogs and a large portion of the old Randall newsletters. It's a small investment in return for a lot of information:
http://intersquare.com/knifeweb/desc.htm
However, over time I found out there were a few missing links: It went from this 1945 catalog to the 1948 catalog, a span of three years:
Two of the missing links were in the form of two
different 1945 catalogs that came up on e-bay:
After sorting out the sequence, the blue catalog depicting a Model 3-6 emerged as the first 1945 catalog. There were two significant differences between the 1st and the 2nd & 3rd: Bo didn't initially offer a 5" version of his Model 4 (I mentioned this in another thread), and he offered both a 4" and 4 1/2" blade length for his Model 7:
In the 2nd and 3rd 1945 catalog, a 5" Model 4 is offered and a 4" Model 7 is not available! There is no other resource other than those two "missing" catalogs that provides this information. I ended up selling my catalogs to a guy who needed them for his collection, but they served my purpose.