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I surmise that while it was purchased new, it was most likely from earlier manufacture -- sitting in inventory from the vendor -- hence, New Old Stock.

What's the packaging like? Perhaps that...

NOS = New Old Stock

Also, see Floridaboy's post (#10) above as he elaborates on the definition.

The fact that the case says "West Germany" (i.e., before the fall of the Berlin Wall), would lead me to believe that the razor is indeed NOS. As already mentioned, Solingen blades are quality, so...