Jose,
Here is a picture of a pair of old kora that have heavy, thick blades. I ran these by our friend, John Powell, who had this to say:
"Nice pair of old heavy kora. The use of such heavy examples for fighting was largely restricted to rampart defense. There was specific training in the use of these heavy versions of the kora for that purpose. Your two are likely from the late 18th or early 19th century when these weapons were still in use for defending fortifications. That would make them of similar age to the other kora you showed me."
Thickness of the blade in front of the hilt is just under a half inch, and this tapers to about a quarter inch at the end of the blade. When wielded with force, I believe the tip would easily pierce most armor of the time. These are more like an axe than a sword.
Ian.