I see that you call them souveniers, Sajen. Aren't they more a mythic creation for tourists than an actual weapon to be used by locals ?
Is this link a reasonable story ?
Oh, I guess that there are also real weapons which were used as them. But these are very rare. My example with bone grip could be such an example like the ones in the pictures. It will be the same as with many other knives like Bosnian bichaqs, Canarian knives, faca de ponta, Albacete daggers and many others. The examples for souvenir developed from real weapons.