The Seiko H556A is a quartz analog-digital (ana-digi) movement introduced in the 1980s, primarily used in models like the Seiko Sports 100 and Silverwave series. This movement is notable for its combination of analog timekeeping with a digital display, offering features such as a chronograph, alarm, and dual-time zone functionality.

Parts List for Seiko H556A

A detailed parts list for the Seiko H556A movement is available in official Seiko technical guides, which include exploded diagrams and part numbers for all components. These guides are essential for servicing and repairing the movement.

Some key parts include:

• Fifth Wheel (Part #701 655), a critical component in the movement’s gear train.

Many watch parts suppliers provide components compatible with the H556A, making it possible to find replacements for worn or damaged parts.

Additional Resources

• Seiko H556A Technical Guide: A comprehensive manual detailing the movement’s functions, disassembly, and reassembly procedures. This guide is invaluable for understanding the inner workings of the H556A and for performing maintenance or repairs.

• Seiko Quartz Data Sheets: Collections of technical sheets and service manuals for various Seiko quartz movements, including the H556A, providing in-depth technical specifications and servicing information.