Gentlemen, as much as I hate to contradict the experts, I have a 720, which is a 1982 frame purchased new as a frame in 1983, that does not have cantilever studs (and never did, by the way. I always wanted them, but they were not available at the time!).
Rudi is correct - the 1982 models did not have the canti mounts. They were adapted in '83, and lasted until the model's demise in 1985.
-Kurt