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Originally Posted by Roland_M
3: I am very sure, that in Japan the length of blade is measured along the back edge (1 Shaku= 1 foot; 1 Sun ~ 1.25 inch).
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Roland, on Japanese swords the cutting edge is the same as the measurement used for blade length (nagasa), it is a straight line. That is how I measure all of my swords as well.
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The blade length (nagasa) is measured in a straight line from the mune-machi (back blade notch) to the tip of the kissaki (point).
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