So I just picked up 3 Schlage M-series door locks. One is a lever that says "M-40" on it and the other two are "M-84". Now I can't find anything about these locks anywhere on the internet. As far as I can tell the 'm-series' are magnetic locks, yet these are older completely mechanical key locks (will post pictures in a bit).
Does anybody know anything about this elusive Schlage M-series?? They came out of an office building, the owner switched locks on one floor and was selling em $8 a pop.