eiko H557A – Parts List

The Seiko H557A 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 combines analog timekeeping with a digital display, offering features such as a chronograph, alarm, and dual-time zone functionality.

Parts List for Seiko H557A

A detailed parts list for the Seiko H557A 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:

• Pallet Arbor: Part #72S/CYL/AS

• Roller: Part #82S/CYL/AS

• Stem: Part #200/203F

These parts are crucial for the proper functioning of the movement and are available for purchase from various watch parts dealers.

Additional Resources

• Seiko H556A & H557A 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 H557A and for performing maintenance or repairs.

• Seiko Quartz Data Sheets: Collections of technical sheets and service manuals for various Seiko quartz movements, including the H557A. These documents provide in-depth technical specifications and servicing information.