So I met a fellow SAK collector today, who showed me one of his rarities. I was already imposing a bit with taking photos, so apologies for the mediocre quality, but with poor lightning, and even poorer skills, that was the best I got.
According to the owner, the scales are plastic and he believes it came out of the factory like this. As he is an expert on knifes I have no reason to doubt that assessment.
My guess its from the 50's and its 82mm but I'm a noob when it comes to vintage Wengers.
Anyone got some information on this model?