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It certainly must have a blade suitable for shaving with for sure. There are quite a few steel alloys the are quite suitable for making a straight razor blade.

Stainless steel's main advantage in...

I'm far from being an expert either but I did find a current definition of stainless steel here What Is Stainless Steel? .

By the looks of it the Patent Cobalt-Chrome Steel has a chromium (Cr)...

Make that two, I am working on a 7 day set. ;)

Bob

According to this article https://www.quora.com/What-is-cobalt-steel cobalt was "added to one grade of austenitic stainless steel". It would be interesting to find out if Darwin Patent Cobalt Steel...

Very nice find and the first Darwin straight razor that I have seen or heard of. I have seen Darwin Patented Cobalt Steel referred to as stainless steel in a thread on the much sought after Darwin DE...