Found this on Ebay, at a reasonable price for the Chinon alone--Varda company Stakeout camera. Apparently Chinon had one of the more advanced winders of the time, with the ability to set a variable number of shots, with a variable delay. Varda's box plugged into a jack on the winder. What little I've been able to find leads me to believe that the Varda box was in turn plugged into an alarm system sensor--VARDA stands for Voice Activated Radio Dispatch Alarm, The company has a web page rather than a site--a single page with nothing more than basic non-internet contact information.
Not sure about the Varda box, but the camera and winder needed some corrosion removed, seem to work fine after that. On the off chance anyone knows more about the Varda part of this, I'd love to hear from you.
I am kind of curious about where this would be used--Seems that it would need to be secured somewhere, otherwise the perp would be likely to hear the camera
And the first 4 pages of Google results are irrelevant to the camera. Adding camera to the search string doesn't help. Maybe there's a gem in there in the 5,000th result, I didn't wade through all of them.