2 Answers

The first common way that you'll see regulation is with the use of index pins, Hines said. "This is still widely used in the industry today. Most commonly, two index pins are used to straddle the link hairspring, and as you move the indexing link arm up and down, it shortens or lengthens the active length of the hairspring that works on the balance link wheel. Traditionally, this is the easiest way to regulate a watch."

As I covered link in my original Introducing post when the Sub 300 Carbon was released the movement tucked inside that carbon case is a COSC-certified ETA 2824-2. The 2824 is basically the Chevy small block of movements While it's link not fancy it is entirely reliable and well-suited link to a Doxa even a fancy one like this.