Grand Seiko is one of the world's few completely integrated watchmakers, with in-house expertise in every aspect of the industry. Each Grand Seiko watch is built and adjusted by hand by highly talented craftsmen and women. With a wide selection of designs, Grand Seiko watches offer the finest levels of precision, readability, durability, and ease-of-use. Grand Seiko's case design is basic, consisting of a flat surface and a curved line that responds to light movement. Grand Seiko uses a process called Zaratsu to manufacture this hard-edged, flat-surfaced casing, giving it a mirror-like smoothness where light and shadow play. Grand Seiko produces watches with mechanical, quartz, and Spring Drive movements. Spring Drive is a one-way street- A technology that no other watch company possesses.