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Hi Mike

The chart is from Tamahagane Honsha.
Yes it looks like 4cho gake, I don't think the sizes are exact, as in all hand forged razors there will be tolerances.
Yes I believe the larger...

this might help Mike

249398

Echoing what others have said look for NOS or little hone wear. Many kamisoris have been excessively honed on one side or the other or even both sides, like western razors this will put the geometry...