The Cunctator is a Delayed Action Self Timer for Richard's Verascope Cameras.
The Clockwork Mechanism opens a red flap to warn the subjects to stand still.
Another flap opens to showing white to indiate the end of the exposure.
This example works though is a little slow.
ill probably free-up with use or a little oil in te right place.
Fits models of Verascope that have a small hook either side of the release button.
Circa 1910 to 1920