In 1969, three automatic chronographs were introduced: the Zenith El Primero, the Seiko 6139, and the Caliber 11 (produced in partnership with Heuer, Hamilton/Buren, Dubois-Depraz, and Breitling). To this day, it is disputed as to which of these aforementioned brands launched first.

Here are representatives of each -

https://www.watchuseek.com/threads/the-first-automatic-chronograph.5226355/?post_id=52237139#post-52237139