Hi Flavio
I agree with you that the undecorated type dagger is more elegant as for the general age I think they are older than 1970s. The patina on both look too deep to have only been made 30 years ago. My guess is 1930s-40s possibly a little earlier. The Warrior in the photo looks to be around 40 years old and the dagger could have been made for him some 20 years earlier when he acsended to manhood that would make his dagger 1950s era. Who knows if these daggers were handed down as family heirlooms?
Lew