Seiko 5P22A – Technical Guide

Introduction

The Seiko 5P22A is a quartz analog movement with a dual time function, introduced in the 1990s. It was engineered to serve the growing need for affordable and functional traveler-friendly watches. The 5P22A supports independent setting of two time zones via a primary time display and a secondary hour hand, often in a 12- or 24-hour sub-dial.

This movement is recognized for its reliability, slim profile, and intuitive design. It is typically found in dual-time dress and casual watches, especially models aimed at global travelers and professionals.

Technical Specifications

Functional Overview

Dual Time Display

The 5P22A provides two independent hour indicators:

• Main hands: Hours, minutes, central seconds (primary time zone)

• Sub-dial or additional hand: Displays a second time zone (hours only, typically 12-hour format)

The secondary hour hand can be adjusted independently of the main time, allowing users to track two time zones simultaneously.

Time Setting Procedure

Main Time:

• Pull the crown to position 2

• Set hours and minutes (central hands); seconds hand will stop (hacking)

• Push the crown back in to restart

Second Time Zone:

• Depending on the model, the second time zone is adjusted by either:

  • Pusher button at 2 o’clock or 4 o’clock, or

  • Rotating the crown in position 1

Refer to the specific watch case design to determine control method.

Battery and Power

• The 5P22A uses the SR621SW 1.55V silver oxide battery

• Expected life is approximately 3 years under standard use

• There is no low battery indicator; end-of-life typically results in sudden stoppage

After battery replacement, hands may need manual realignment using the reset mode.

Servicing and Maintenance

Battery Replacement

1. Remove the case back carefully (usually snap-on or screw-down)

2. Replace with SR621SW battery

3. Use plastic tweezers to avoid static damage

4. Clean contacts if necessary

Manual Reset

• Some versions of the 5P22A include a manual reset pinhole or contact on the movement

• This allows the hands to be re-synchronized if desynchronized during battery change or shock

• To reset:

  • Use non-metallic tweezers to briefly short the AC contact to the battery + terminal

Common Issues & Troubleshooting

Applications & Models

The Seiko 5P22A was used in a range of dual-time quartz watches throughout the 1990s and early 2000s. Key features of these models:

• Sub-dial at 6 or 9 o’clock for second time zone

• Some models have a 24-hour or GMT-style format

• Often part of Seiko Quartz, Seiko International, or Dress lines

• Steel, gold-tone, and two-tone cases with mineral glass crystals

• Slim dress profiles — often 8–9 mm case thickness

Caseback identifiers often include “5P22-xxxx” for model verification.

Summary Table

Conclusion

The Seiko 5P22A is a compact and efficient dual-time quartz movement that delivers functionality, reliability, and simplicity. It’s ideal for travelers and professionals who need a secondary time zone without digital clutter. With low power consumption and minimal servicing needs, the 5P22A remains a favorite among Seiko enthusiasts who appreciate smart analog design and clean dial layouts.