Which weapon does not match the others?

yataghan
262
falcata
333
saber
1240
kukri
557
The saber has a single-edged, curved blade similar to the other listed types of white weapons.However, there is a difference - there is an external arc of the blade in the saber sword. Meanwhile, all the others - see photo - have blades on the inside.
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Tschuka
reach: rather globalmelee weapons