A quality hand-wound or automatic movement contains at least 17 jewels. A movement based on a mainspring which is wound by hand. When wound, it slowly unwinds the spring in an even motion. A complication on a watch that can strike the time in hours, quarters, or seconds by means of a push piece. The inner workings or assembly that make up the main timekeeping mechanism.
Movements are either quartz or mechanical.
A movement which allows a watch to be worn without being wound. This technology employs the vibrations of a tiny crystal to maintain accuracy of time and is powered by a battery. Most quartz movements are made in Hong Kong, Japan, or Switzerland. Some have power reserves that can last up to 500 days. A watch with a barrel-shaped case with 2 convex sides.