Not all WW2 blades had a hamon. NCO blades were plain tempered steel, and more than one signing smith made the same for officers Shin-Gunto. It's a very complicated subject. Patina on the nakago can be removed by over-cleaning. I would like to see pictures of the mounts as that can be a clue. I would take this over to one of the specialist pages like Nihonto Message board or warrelics.eu where there is a bigger pool of knowledge.
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