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That means absolutely nothign. ANY razor made in shallow hardening steel will show those lines and spots on the spine, because that is where the thickness of the spine and the trapped heat prevents a...

I can all but guarantee that you are correct.

Seeing as I do have some experience on which to base my opinion, I would say that it is flat out impossible to differentiate between Tamahagane or other steel on a hone.
Any difference you feel is...