Have used up my own references with little luck. Although a couple of models ,the 3925 and 30?? ,have the same frame and blades.
References I've have used are Price (both price guide and Big book), Houston and Voyle's "Antique knives".
Other than this unlisted model #, I,m happy with the knife. Has the look and feel of an older Pre-WWII Winchester
Thanks Wm