Manually Operated OTIS Traction Elevator 

Very nice elevator runs like a Swiss watch, very smooth. while I know you were not able to see the machine room, I wonder if the original traction machine is still in service. Those were built to last.

A very common sight during the WW2 era in the 1940s and 50s within most buildings

DieselDucy & STL Elevators has also filmed this. That's the same operator too.