This is a 1/10 HP Sync/Interlock Motor manufactured by Tri-Tronics in Burbank, CA. It was installed to power a 16mm film projector in interlock/sync with three 16mm magnetic sound dubbers.  The system ran forward and backward in sync. When the system was dismantled in the 1980s the motor was working as described above and has been in storage ever since. The only noticeable defect is some rust on a cog wheel at one end of the shaft. It is sold now, untested, as is. (Probably working; the shaft turns smoothly and easily by hand.) The following specs are visible on the motor: