The Seiko 8523A is a robust and accurate quartz analog movement that combines precise timekeeping with a convenient date function. Manufactured primarily in the 1980s and 1990s, this caliber is part of Seiko’s trusted lineup of quartz movements, known for their durability, efficiency, and ease of maintenance. The 8523A offers reliable performance for daily wear, making it a popular choice in Seiko’s mid-range quartz watch models.

Technical Specifications

• Caliber Number: 8523A

• Movement Type: Quartz (Analog)

• Display:

  • Hour, minute, and seconds hands

  • Date window, usually located at 3 o’clock

• Accuracy: Approximately ±20 seconds per month

• Battery Type: SR927W (1.55V silver oxide)

• Battery Life: Approximately 2 to 3 years

• Jewels: None (electronic quartz movement)

• Crown Positions:

  • Position 0: Normal operation

  • Position 1: Date adjustment

  • Position 2: Time adjustment

Key Features

Precise Timekeeping

The 8523A movement is powered by a quartz crystal oscillator, providing consistent and accurate timekeeping with a typical variance of ±20 seconds per month, suitable for everyday use.

Date Functionality

Equipped with a date complication, the movement displays the current date through a window typically positioned at 3 o’clock, allowing easy readability and manual adjustment via the crown.

Efficient Power Consumption

Utilizes an SR927W silver oxide battery, ensuring efficient energy use and a battery life typically lasting between two and three years.

Operating Instructions

Time Setting

1. Pull the crown to the second click (Position 2).

2. Rotate the crown to adjust the hour and minute hands to the desired time.

3. Push the crown back to Position 0 to resume regular operation.

Date Setting

1. Pull the crown to the first click (Position 1).

2. Rotate the crown clockwise to advance the date.

3. Avoid setting the date between 9 PM and 2 AM to protect the date-change mechanism.

4. Push the crown back to Position 0 after completing adjustments.

Battery Replacement and Maintenance

• The movement uses an SR927W silver oxide battery.

• Battery life typically ranges from 2 to 3 years, depending on usage conditions.

• Professional battery replacement is recommended to preserve water resistance and movement integrity.

• No additional reset is required after battery replacement, but time and date should be checked.

Maintenance Recommendations

• The 8523A is a fully electronic movement, requiring no lubrication or complex servicing.

• Avoid exposure to strong magnets, shocks, and extreme temperatures to maintain accuracy.

• Clean the watch regularly to maintain appearance and function.

• For water-resistant models, have water resistance tested periodically.

Watches Featuring the 8523A

The 8523A caliber has been used in:

• Seiko’s quartz watches from the 1980s and 1990s, focused on reliability and simplicity.

• Models featuring classic analog designs with date display.

• Timepieces intended for everyday use with durable, dependable movements.

Summary Table

Conclusion

The Seiko 8523A quartz movement offers consistent, precise analog timekeeping with a convenient date function. Its efficient battery use and ease of maintenance make it an ideal choice for reliable everyday watches. The 8523A exemplifies Seiko’s dedication to producing high-quality quartz movements that blend durability with simplicity and accuracy.