Greetings Fernando,
The blade shape and profile reminded me of a blade I'd seen some time ago, but a modern military knife. I can't help thinking that the blade shape may be historically featured on the Iberian peninsula and be a traditional shape very specific to a particular area. Aitor hunting knives have a stylistically similar blade shape also.
Here's the Spanish military knife I recalled..
Sorry I can't help further, just thinking out loud!
