I remember reading something about the huge legal fights those two companies would get into. There were two firms because one invented the knife that earned the adoration of the troops when they bought them personally, but the other was a cutlery manufacturer who was actually in a position to deliver the quantity required when the Swiss military decided to start procuring them directly.
I don't know why two firms were needed for neutrality with pocketknives. I know they've had to do that with guns, the "SIG" in SIG-Sauer is the Swiss company, and Sauer is the German one that was required to get around their laws so they could produce and sell SIG's designs, but I don't think it applies to knives?
From the article linked, it seems like Victorinox had the SAK contract for the Swiss armed forces, making it the "official" SAK, does that mean historically it was Wenger that came up with the design of knife that was popular with the troops, making them the "original" SAK?
I think that because I recall reading that was the terms of the settlement they finally reached, one was "official" and the other was the "original"…