Color segment subdials for using as regatta / yachting watches
In the 60s and 70s were produced loads of watches for multipurposes - including colored segments on the right subdial for showing 5/10/15 minutes which are necessairy to use the watch for a regatta start. Which brands did yachtings and regatta watches? A LOT! Read here a little post about these watches. But - it´s just a start... ;)