Most people know they like the look of a watch. Fewer know why it was built that way. The chronograph, the diver, and the dress watch are three of the most important watch types in the hobby, and each one exists for a reason. Once you understand the purpose behind the design, everything starts to make a lot more sense.

Most people wear a watch without ever thinking about what is happening inside it. If you own an automatic mechanical watch, or you are thinking about getting one, there are a few things worth knowing. How it works, what makes it different, and why it matters. This is where to start.