Chek the blade with japanese sword expert, i think it is not old blade but made in period of mountings, by some blade smith, maybe for general? It has file marks but they are crude, and it has stamp partialy seen under habaki, im 90% sure it is not nihonto.
Get it examined with expert for japanese swords, it is finely made, it could be valuable.
Signature is done on made, not adition.
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