Japanese Tanto (FarCry 3)

“The tanto is a Japanese dagger that was carried by the samurai. Wielding one of these will increase the damage dealt in melee combat.”
— in-game handbook
“Japanese Tanto blades were once coveted items carried by the Samurai, shrouded in lore and god-like craftsmanship, but now they’re used to spear smoked meat at chain restaurants.”
— Survival Guide

The Japanese Tanto is unlocked when you have found six Letters of the Lost. It does more damage than the Machete. Unlike other Signature Weapons, this weapon is automatically owned once unlocked.