"Armour Piercing Keris" ???

[Timo Nieminen]

Originally Posted by A. G. Maisey

You make a good argument Timo, but the problem is that Brojoguno keris were witnessed and recorded as having pierced Dutch breast plates.

Why is that a problem? As I said,

Originally Posted by Timo Nieminen

Given that some armours will be thinner, will have defects, will have thin spots, etc., the best one-handed stabs delivered by humans, hitting square-on, should be able to occasionally go through (not against much-thicker cavalry breastplates, though).

In practice, the average breastplate should be able to resist almost all stabs. But that doesn't mean that all breastplates stop all stabs.

It might be worth seeing what the oldest written sources say, whether they say "breastplate" specifically or just a more general "armour" (with "breastplate" being a later gloss).