This device is an adjustable remote control timer Model ST-10, made for use with Keystone slide projectors K-310 and K-500D. 

It features one (1) dial that will set the slide-changing interval up to one minute, with second (2) dial to trigger an immediate change or to hold the program in place.  It had a 4-pin jack, with cord, to connect to the projector. 

Includes:  Timer, original instructions, original box and packing.

This was part of my Father's estate.  I don't think he used it or just stored it back in the original box. 

CONDITION
Mint cosmetic condition, unused in original box. Working condition is unknown, since we don't have the appropriate projector to test it with.


Great for movie room shelf decor, theatre room, movie prop or just a cool vintage decoration for any room.