I'm no expert, but I would venture to say I believe they look pre-1970. I could be wrong, but I know my 1972 Mark IV has a "thin" Lincoln emblem similar to whats on the Mark VIII's. I know some of the full-size Continentals used the "fat" emblem like what you've got a little longer, and I know some hubcaps that were used on early-80's Lincolns looked "older" than they actually were as well. This is all off the top of my head, and I'm just guessing. There's a website I've been on before that sells OEM-style wheels and hubcaps for older cars. That would be a good resource right now. I'll try to look them up.