Valjoux Cal. 76 is a pocket watch column wheel chronograph movement. Introduced around 1946, it was produced through about 1974 and was exclusive to Heuer. It featured a six-column wheel to control the chronograph function. The chronograph used a central seconds hand with a 30 minute counter. It was a mono-pusher design.
Heuer also had a split seconds version as well as a special version of Cal. 76 with a central 1/100 minute (decimal) hand.