Possible 60's Tape Synchroniser project

[Cobaltblue]

I was very pleased to receive this from Peter_Kaye after he offered it in the sales section.

https://www.vintage-radio.net/forum/showthread.php?t=212928

The case was ideal for another of my little projects but it looked interesting anyway. My immediate thought was a tape slide synchroniser.

These were popular in the 60's to allow people with a carrousel type slide projector to bore multiple groups with the same slides and talk

I remembered seeing several in Practical Electronics and I think Radio constructor.

It arrived this afternoon and I did a quick dig and the design in PE Sept65 seems to have many similarities. https://www.worldradiohistory.com/UK/Practical-Electronics/60s/Practical-Electronics-1965-09.pdf

Until I get a chance to backwards engineer it I won't know how close but superficially very similar. The major obvious differences extra relay different switching and different assembly.

There are only so many things you can do to achieve the same result so it still may be a different design from another source.

There are a few wires broken off to add to the mix.
Happy to hear from anyone who recognises it. I don't intend to keep it as a going concern as I have neither slides nor projector and the box is earmarked for a small project, but I don't like mysteries and once I have dismantled it I may never know for sure what it was.

Cheers

Mike T