I decided to scan this older Instruction sheet provided with knives sold in the US, and realized that the Connecticut based distributor was listed as "Victorinox of Switzerland Ltd.". I never paid much attention to this, but it might help date a knife as prior to SABI, which I think was created when they took it public. There are also some two-tone green instruction sheets that list the company as "Victorinox of Switzerland Ltd.", but I believe the brown paper sheet to be older.
update: removed instruction sheet date estimate, got confused on which box it came in.