Engine turn is a type of watch case decoration where the surface of the case is engraved with a pattern of interlocking circles that resemble the parts of an engine. This pattern is created using a specialized machine, such as a lathe or milling machine. The pattern can be done in several different ways, including straight lines, curved lines, and even overlapping circles. The engine turn pattern can be done in a variety of different metals and finishes, such as gold, silver, and stainless steel. The result is a unique, eye-catching look that adds interest to any watch.
