As a matter of fact, other objects give support to the mail-piercing ability of bladed Indian ( or thereabouts) weapons.
Not long ago we have discussed the so-called Zirah Bouk, a " mail-piercer" in translation. The only qualification of that khanjar-like weapon is the reinforced tip, either as a diamond-shaped or as a prominent central rib. The very name of it is an incontrovertible evidence.
I have a likely Afghani Tulwar with the same feature, and katars with diamond-shaped tips are dime a dozen. Afghani Khybers solved the same engineering problem by their T-section.
These are the examples of a mandatory mechanical engineering course on the strength of construction materials.
Thus, Indian weapons with the ability to penetrate mail were in abundance.
Whether a straight stab with katar or a more circular one with a dagger-like weapon ( khanjar) is more economical and effective is above my paygrade.
Looking for a katar with obvious mail-induced damage to the tip is, IMHO, an exercise in futility. A stuck one would remain on the battlefield, a lightly damaged would be fixed and a badly damaged would be discarded. In any case, none of them would be preserved in the armoury or sold to a collector.
BI is 100% correct: the success of an attempt to penetrate mail depends on relative qualities of a blade vs. mail. What happens if an irresistible force meets an immovable object is a question better left to philosophers or theologians.
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