The Seiko H558A is a quartz analog-digital (ana-digi) movement introduced in the early 1980s, famously used in models like the Seiko "Arnie" (reference H558-5000) and Silverwave series. It combines analog timekeeping with a digital display, offering chronograph, alarm, and dual-time zone functions. Knowing its parts is essential for servicing and repairs.

Key Components and Part Numbers

Some critical parts of the Seiko H558A movement include:

• Stem: Movement side and crown side components essential for winding and setting time.

• Guide Plate for Winding Stem: Supports smooth stem operation.

• Intermediate Minute Wheel: Part of the gear train responsible for minute hand movement.

These parts are vital for proper functioning and are used in various configurations across different Seiko watches featuring this caliber.

Accessing the Full Parts List

For a comprehensive parts breakdown, refer to the official Seiko H558A technical documentation. This includes exploded diagrams and part numbers, facilitating accurate identification and sourcing of components for maintenance and repair.

Additional Notes

• The H558A shares similarities with other Seiko quartz analog-digital movements from the same era, which can help when sourcing parts or understanding service procedures.

• Servicing this movement requires familiarity with both quartz electronics and mechanical analog components.