Nice vacuums there. The machine I want to find most is like that blue one, but in green and yellow!
The beige one is probably just below TOL. The TOL would have a headlight, variable speed control instead of two speed and the controls for the canister and PN were on the handle near the PN plug.
The little guard on the motor may have been added later I think. Not sure, but I remember a recall about these vacuums because people could easily put their fingers in the fan through that opening on top. The brown and tan at top has the motor enclosed in the plastic, so there was no need for the guard.