Well he was very talented with his hands. Made knives for himself and for the environment (rural area). Always built and repaired things. From home machines to tractors. Regarding the search option: I used it but didn't get the information I was looking for, so I guess I'm doing something wrong...
Thank you for your time.
I am not interested in the value, more in the history and I will ask my mother. But, I sure assume that they are from my father.
Because I remembered seeing something similar in a box from the attic, I went back to it and continued rummaging through it and realized what reminded me of these pliers: a packaging for the tool and guess what was inside? Another brand new pair of pliers, still with traces of preservative oil...