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I had a thought, Magnus, There are lots of Kamisori for sale on Ebay. They seem to have some way to identify the makers.
You might print out a pic of the Kanji, tape it to the side of your...

Thanks, Oz! Sounds as if the best course of action. Magnus?

Man, I have been searching on the internet. SOMEWHERE there has to be a list of makers and their signatures.......
Have not found it yet. Let me get OZ over here! :idea:

Wish I could help! Close-ups could help. There is an Ebay seller who explains this on razors he sells. Might get a look if I knew what to look for.