I went by an Army Surplus store today on the way back home, and seeing that they had SIs, decided to take a look at them. While pricey, I found three that lacked tang stampings on the blades - not only lacking year markings (not too unusual now), but also lacking the reverse "Wenger / Delemont / Switzerland / Stainless." Were these terribly common mistake SAKs?
Pictures shall come on Sunday or Monday.