Search:

Sounds like you've honed a few things before. :)
I'd still recommend sending at least one of them out for a professional honing so you will have a reference as to how sharp a sharp razor really is....

Blue Diamond was a Norvell and Shapleigh trademark in the early 1900s I believe. Good razors and the ones I've seen had pretty scales on them.
Birko I know nothing about, but being a Solingen razor,...