Crown
Crown is usually at the 3 o’clock position. It could be categorized in:
Usual Crown──
You can push it out directly to adjust the time on the watch. If it has calendar on the watch, the first stop would be for the date, the second stop would be for the time.
Screw Crown──
The crown has screw on it. You can simply turn it counter-clockwise to adjust the time on the watch. It improves the waterproof of the watch.