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It seems like the original patent was in 1939.
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Interesting that the German Trademark and Patent office doesn't have a listing before 1951, and they always seems to include the...

Never did any research on Friodur, the books I have are not helpful for German razors.

Many love them, Tom told me he prefers the carbon steel. Your opinion Glen is pretty good in my book since you honed a few of these.

And how does one recognize the first generation or referred to has the older ones?

I can't comment on the Friodur but I do have a couple of carbon steel Henckels. Fine shavers for sure, how does the Friodur compare?

Nice work guys, seems like nobody likes the original scales on the Friodur, surprising that I don't see the inlay transferred from the original scales.