[Zhenyu Li]

The cutacha is a type of sword-like edge weapon used in Central American during 19th 20th century.There are some examples really look like kind of Japanese sword.So do they really have any relationship?

[Stephen Curtin]

In profile it looks vaguely like a katana, but the cross-section seems completely different. I'd say the similarity is just coincidental.

[Jeffrey Faulk]

Yeah. That cut off and ground tip is just easy and cheaper to make than a proper saber point. Japanese weapons didn't start really getting into the popular consciousness until the 1900s, so I don't think there's much, if any, relationship.

The Latin American countries were generally not very prosperous, so their weapons and blades tended to be either imported old stuff or locally made stuff that didn't really come up to the quality of other countries'. This would be one example of such.

There's a story that some British officers had their saber hilts modified to take Japanese blades, but that one also sounds like a myth.

[Mikko Kuusirati]

[Zhenyu Li]

[Mikko Kuusirati]

Well, the Japanese styles were originally derived directly from Chinese blades (for examples of the earliest Japanese types, look for chokuto in kiriha zukuri; for examples of their mainland parentage, search for stuff like Han dao). And in turn the modern American tacticool "tanto" point is a simplistic approximation of the Japanese shinogi zukuri geometry (which is, in fact, quite rare on actual tanto but very common on swords).

Some Burmese and Thai dha also have point geometries similar to Japanese blades, sometimes complete with yokote; some of them even have actual Japanese blades. There are also swords very similar to the chokuto and their Chinese ancestors from all around mainland Asia, for example some Tibetan/Bhutanese swords have very similar blades (on very distinctly local hilts).

And, in general, plenty of machetes and similar tool-cum-weapons from all over the world, especially more or less homemade ones, have angular points that resemble the yokote in profile (and profile only!) because it can be easier to grind than a smooth curve. There is such a huuuge multitude of regional, cultural, sub-cultural and temporal styles and such endless variety within them all that listing specific examples is beyond me. That cutacha you posted could be counted among them, though.

PS. For the sake of clarity - the yokote is the angular ridge line, characteristic of certain Japanese blade types, that sharply separates the point from the rest of the blade. In its fully developed form, like seen on the stereotypical shinogi zukuri tachi and katana, it's a somewhat pronounced, forged in ridge that changes every facet of the point's geometry, not just the angle of the edge.

[Zhenyu Li]

[Zhenyu Li]

There are some pictures.They are the first kind of swords with curve shinogidukuri blade(the middle one),Turkish sword in scabbard and a Chinese style straight sword.

[Lafayette C Curtis]

There was probably a back-and-forth process going on. The initial design spread from China through Korea to Japan, then developed in Japan during times of relative isolation, and then went back to mainland China and Korea during periods of resumed (if turbulent) contact in the 14th to 17th centuries. Peter Dekker had an entire category of blades with a cross-section that might have been inspired by Japanese swords in his classification of late Ming and Qing dao: http://mandarinmansion.com/chinese-saber-typology