Here is a special flyer from Chronosport (a major UK / US watch retailer of the 1960's), announcing the introduction of the Chronomatics -- from Heuer and Breitling. I thought that it was interesting to see how these chronographs were being pitched -- to the Action Crowd!!.

Also, interesting to study the dials of the Heuers. It looks as though these chronographs were made by the art department, rather than the watchmakers, as they bear little resemblance to the chronographs that were actually produced by Heuer.