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Absolutely. Maruka stamp is only from Nakayama.

Since a Maruka on top would be obviously fake and considering I brought the names of the above vendors to the discussion I just want to clarify. I will add some pics I found. I have seen them sell...

A Maruka stamp should be on the side of the stone, not face, so it wont interfere with honing and it wont be lapped off and removed with honing. Well eventually as the stone wears down it will but...