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I forgot to say that I contacted Boker and asked about the Boker Edelweiss:

I asked:
I'd like to know more about the Boker Straight Razor Edelweiss.
In the website it says it's made with a...

I made a final decision and have just bought the Boker Straight razor stainless black for $133,44 including shipping.

I hope it will be shipped with no problems, it's a long journey to my country...

I'm looking at these models from Boker:

Boker Straight razor stainless black: Boker offers Straight razor Boker Straight razor stainless black.
Boker Straight Razor Edelweiss: Boker offers...

Regarding stainless steel vs carbon steel, I have found these that answered my question:
http://badgerandblade.com/vb/showthread.php/155625-stainless-vs-carbon-steel-straight-razors
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