The Seiko A134A is a vintage digital quartz movement from the early 1980s, part of Seiko’s A-series LCD digital modules. Designed for straightforward, everyday use, the A134A includes core digital functions such as time display, calendar, alarm, and stopwatch. It was featured in many of Seiko's rectangular and square LCD digital watches, aimed at users looking for a reliable, no-nonsense timekeeping tool.

Technical Specifications

• Caliber Number: A134A

• Movement Type: Quartz (Digital LCD)

• Display Type: Liquid Crystal Display (7-segment style)

• Functions:

  • Time (12-hour format)

  • Day and Date

  • Daily Alarm

  • Stopwatch (1/10 second resolution)

• Backlight: Not included

• Battery Type: SR1120W (1.55V silver oxide cell)

• Battery Life: Approximately 2 years

• Accuracy: ±15 seconds per month

• Module Dimensions:

  • Width: ~26 mm

  • Height: ~22 mm

  • Thickness: ~5 mm

Features and Modes

The Seiko A134A was designed to deliver essential timekeeping tools with intuitive button operation. Though not feature-rich by modern standards, it was ideal for day-to-day wear.

Timekeeping Mode:

• Standard display of hours, minutes, and seconds

• 12-hour format with AM/PM indication

• Time adjustable via set mode

• Hourly chime (varies by model)

Calendar Mode:

• Displays day of the week and numerical date

• Manual correction required at month-end

• No automatic leap year adjustment

Alarm Mode:

• One programmable daily alarm

• Audible tone via a piezo buzzer

• ON/OFF toggle depending on the model configuration

Stopwatch Mode:

• Resolution: 1/10 of a second

• Total measurement: up to 59 minutes, 59.9 seconds

• Start, stop, and reset functionality

Button Layout (Typical)

Watches using the A134A movement typically include three or four buttons:

• Button A (Top Left) – Mode selection (cycles through Time, Alarm, Stopwatch, Date)

• Button B (Bottom Left) – Set or select digits

• Button C (Top Right) – Start/Stop or increase values

• Button D (Bottom Right, if present) – Reset stopwatch or toggle alarm/chime

Button functions can vary slightly depending on the case design, but most follow this structure.

Battery Replacement and AC Reset

After a battery change, a reset is usually required to reinitialize the integrated circuit.

Procedure:

1. Open the case back using a proper case knife or tool

2. Remove the used SR1120W battery using plastic tweezers

3. Install a new battery, ensuring correct polarity

4. Locate the AC (All Clear) contact point on the circuit board

5. Use metal tweezers to short the AC terminal with the battery’s negative terminal (case or spring) for 1–2 seconds

6. The LCD should show a full screen flash (all segments), then return to default time mode

Skipping this reset may result in a blank or frozen display.

Maintenance Tips

• No lubrication required – digital modules are dry and fully electronic

• Keep dry – Most watches using A134A are not water-resistant by today’s standards

• LCD aging – Watch for fading or segment loss, which typically indicates deterioration

• Alarm issues – Check buzzer contacts for oxidation if the alarm becomes faint or stops

If the display or circuit fails entirely, replacing the full module using a donor watch is usually the only viable option.

Watch Models and Applications

The A134A was commonly used in rectangular or square Seiko LCD watches sold globally in the early 1980s. These watches were marketed for general use—offering an alternative to mechanical and analog quartz watches. Models typically featured stainless steel or chrome-plated cases, with top-printed function labels and basic crystal protection.

Conclusion

The Seiko A134A digital quartz movement reflects the practical, efficient spirit of 1980s Seiko LCD design. Offering all the essential digital functions in a compact, easy-to-service form, the A134A remains a durable and collectible option for vintage digital watch enthusiasts. With proper care and the occasional battery reset, these modules continue to keep time reliably, decades after their debut.