Seiko 3823A – Technical Guide

The Seiko 3823A is a high-quality analog quartz movement with a date complication, introduced in the early 1980s as part of Seiko's prestigious Grand Quartz series. As a member of the 38xx family, the 3823A was designed for slim-profile, high-accuracy quartz watches, combining long-term stability, reliable construction, and fine finishing suitable for Seiko’s upper-tier models. It represents a transitional caliber—offering advanced quartz performance before the emergence of thermo-compensated and 9F-grade movements.

Technical Specifications

Movement Overview

The 3823A was used in Seiko’s Grand Quartz models and is notable for its:

• Smooth, precise hand motion (1-second step motor)

• Durable metal gear train

• Calendar system with a quickset date

• Minimalist dial layouts, often with applied indices and high-end finishing

Watches with the 3823A movement typically feature clean aesthetics, framed date windows, and “Grand Quartz” branding.

Key Components and Layout

Dial Side:

• Calendar Mechanism: Includes quickset date wheel, calendar jumper, and finger.

• Setting System: Directly connected to the crown and stem.

Circuit Side:

• Quartz Oscillator: 32.768 kHz tuning fork crystal.

• Integrated Circuit (IC): Controls signal processing and motor impulses.

• Step Motor & Coil: Drives the gear train using 1-second electrical pulses.

• Gear Train: Translates motor pulses to mechanical movement of hands.

Battery Replacement

Battery Type: SR1120W (391)

Procedure:

1. Open the case back with the correct tool.

2. Remove the old battery using non-magnetic, plastic tweezers.

3. Clean battery contacts with pegwood or a fiber brush if oxidized.

4. Insert a new SR1120W battery, ensuring correct polarity.

5. Check for second-hand motion (should resume in seconds).

6. Set the time and date.

7. Reseal the case with proper gasket inspection/replacement.

⚠️ Note: Avoid touching the circuit board or coil. Electrostatic discharge can damage the IC.

Servicing Guidelines

While quartz movements require less maintenance than mechanical watches, periodic servicing ensures continued accuracy and performance.

Serviceable Items:

• Calendar mechanism: Clean and lightly lubricate the dial-side gears.

• Hands: Inspect for misalignment or dragging.

• Coil and Contacts: Check for corrosion or disconnection.

❌ The IC is factory calibrated. There are no manual trimmers for regulation.

Common Issues and Remedies

Legacy and Collectibility

The 3823A is found in a variety of Grand Quartz models, including reference numbers like:

• 3823-7000

• 3823-8000

• 3823-7050

These watches are known for their:

• Sharp, angular cases (often Tonneau-style)

• Linen or sunburst dials

• Applied Seiko and Grand Quartz logos

• Date-only display for minimalist styling

Collectors appreciate these watches for their balance of elegance, quartz reliability, and the enduring appeal of vintage Seiko design.

Conclusion

The Seiko 3823A is a fine example of Seiko’s pursuit of quartz perfection during the early 1980s. Offering excellent accuracy, long battery life, and refined design, it remains a reliable and collectible caliber. Whether preserved in original condition or serviced for everyday wear, the 3823A continues to reflect the craftsmanship and innovation that define Seiko’s Grand Quartz era.