In your 1st and 4th pictures is the cutting edge at the top of the picture? If you look closely at the pictures you have what looks like a "hamon". This is suggestive that this blade might be of tripartite construction, in other words, an inserted edge sandwiched between softer cheeks. The pattern that seems to show along the edge is a result of that construction and the edge being heat treated. You see this in some Indian swords, as well as, a number of other cultures.
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