The Seiko 8523A is a reliable and accurate quartz analog movement designed primarily for everyday wristwatches that require consistent timekeeping and a practical date function. Manufactured during the 1980s and 1990s, this movement is part of Seiko’s proven lineup of quartz calibers, known for their durability, efficiency, and straightforward operation. The 8523A is favored in watches that balance functionality with low maintenance and classic design.

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Technical Specifications

• Caliber Number: 8523A

• Movement Type: Quartz (Analog)

• Display:

  • Hours, minutes, and seconds hands

  • Date window, usually positioned 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

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Key Features

Accurate Timekeeping

The 8523A utilizes a quartz crystal oscillator to provide steady and precise timekeeping, with an accuracy of about ±20 seconds per month. This makes it suitable for regular daily wear and practical use.

Date Function

A date complication is integrated, displayed clearly in a window usually at the 3 o’clock position. The date can be adjusted manually using the crown without interrupting the main time display.

Efficient Power Consumption

Powered by an SR927W silver oxide battery, the movement offers efficient energy use, enabling a battery life typically lasting two to three years, minimizing frequent battery changes.

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Operating Instructions

Time Setting

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

2. Rotate the crown clockwise or counterclockwise to set the hour and minute hands to the desired time.

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

Date Setting

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

2. Rotate the crown clockwise to advance the date to the correct day.

3. Avoid changing the date manually between 9 PM and 2 AM to prevent potential damage to the date-change mechanism.

4. Push the crown back to Position 0 after setting.

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Battery Replacement and Maintenance

• The movement runs on an SR927W silver oxide battery.

• Battery life generally ranges from 2 to 3 years depending on usage.

• Battery replacement should be performed by a professional to preserve water resistance and ensure proper handling.

• No special reset procedure is typically necessary after battery replacement, but time and date settings should be checked and adjusted if needed.

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Maintenance Recommendations

• The quartz electronic movement requires no mechanical lubrication.

• Avoid exposure to strong magnetic fields, shocks, and temperature extremes to maintain accuracy and durability.

• Clean the watch regularly, especially after exposure to moisture or dust.

• Water-resistant models should be pressure-tested periodically to maintain sealing effectiveness.

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Watches Featuring the 8523A

The 8523A caliber was commonly used in:

• Seiko’s quartz analog watches produced in the 1980s and 1990s.

• Models focusing on straightforward, reliable time and date functions.

• Timepieces with classic designs suited for everyday wear.

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Summary Table

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Conclusion

The Seiko 8523A is a dependable quartz movement that provides accurate analog timekeeping alongside a practical date display. Its efficient battery usage, low maintenance needs, and proven reliability make it an excellent choice for everyday watches. This caliber exemplifies Seiko’s dedication to delivering quality quartz movements that combine precision with simplicity and durability.

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