Packard Shutter Rebuilt does B T Instant Synced (No 3)

item #miscboardsaccNo3. This shutter has a 3 1/4" square plate with a 1 3/8" hole. It has been rebuilt and fully tested. It does Time and Bulb and has a built in Flash sync for flash bulbs. If a pin is inserted into a hole in the shutter (ie a small nail