Identify sword signature

Would like to know what the signature says. Also, want to get a matching handle and fittings, or is my only solution a complete replacement. I would need to know age of this katana to have appropriate parts

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Sword signature

Trying to determine the signature for Smith and age of this sword. Total length of sword is 33 & 1/2 inches, cutting edge 25 & 1/2 inches.