Automatic Caliber 11 was a joint venture ca. 1969 between Heuer, Hamilton, Breitling and Buren along with Dubois-Depraz. I had a hard time understanding how this movement was Automatic based on the photographs I was looking at. And then I saw the exploded technical drawings. Fiendish! There is a good primer on the Cal. 11 in Monochrome here: https://monochrome-watches.com/a-closer-look-at-two-underrated-watches-with-calibre-11-the-hamilton-chrono-matic-vintage-corner/. This is also where I sourced technical drawings. This watch would certainly be a star member of my collection.




