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Very nice conclusion to your research. Glad you found what you were looking for. Nice to know that yours was very well done.

I have several also. My favorite is a Westby from the 1830s-40s it is a fabulous shaver.

It was not ground enough to effect the hardening if done correctly. Remember that razors have the finish grinding done after heat treatment anyway.
Once hollow grinding became possible due to...

It could be a regrind. That was not uncommon after hollow ground blades came into vogue. If it is a regrind it was very well done.