I can't tell you anything about the finish, but the smooth Presentation targets were used in the approximate 1967-1980 period. I think the black washers would narrow it down to being from the 1967 to early 1970s period. I also think most Presentations were Goncalo Alves, but I have a pair I think is walnut, at least they look like walnut to me. I'm not very good about identifying different woods. While it might be tempting to refinish the stocks, I think I would try to resist doing anything other than waxing them.