Engine-turning (Guilloché) is an intricate and decorative pattern of designs created on a watch or other metal object. The process involves using a small, specialized tool called a rose engine lathe to create a pattern of parallel lines, circles, and geometric shapes. The pattern can range from simple to complex and is often used to embellish the watch case or movement. The end result is a beautiful and intricate design that adds a unique and luxurious touch to any watch.
