Globe 12 volt gearmotor 15 rpm. Very high quality American made motor.  Brand new. have many

12 volt dc gearhead motor permanent magnet reversible. No load speed 18 rpm @0.125 amp. 
With a 40 oz-in load the rpm is 15 @ .020 amp.  Shaft is 3/16" dia X 5/16"long with flat.
Face mount with 3 ea threaded #4-40 screw holes.