The Seiko 7N82A is a reliable and accurate quartz analog movement featuring a practical date complication. Introduced in the late 1990s, the 7N82A represents Seiko’s continued innovation in producing durable, efficient, and easy-to-use quartz movements. Known for its precision and robust construction, this caliber is widely used in many Seiko watches designed for everyday wear.

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Technical Specifications

• Caliber Number: 7N82A

• Movement Type: Quartz (Analog)

• Display:

  • Hour, minute, and seconds hands

  • Date window, typically positioned at 3 o’clock

• Accuracy: Approximately ±15 seconds per month

• Battery Type: SR920SW or equivalent silver oxide battery (1.55V)

• Battery Life: Typically 2 to 3 years

• Jewels: None (fully electronic quartz movement)

• Crown Positions:

  • Position 0: Normal operation

  • Position 1: Date adjustment

  • Position 2: Time adjustment

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Key Features

Precise Timekeeping

The 7N82A utilizes a quartz crystal oscillator regulated by an integrated circuit, delivering accurate timekeeping with an average deviation of ±15 seconds per month.

Date Display

Equipped with a date complication, the movement displays the date through a window usually located at 3 o’clock, allowing for easy date reference and manual adjustments.

Efficient Power Usage

Powered by an SR920SW silver oxide battery, the 7N82A is designed for low power consumption, providing a typical battery life ranging from two to three years.

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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 accurately.

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

Date Setting

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

2. Rotate the crown clockwise to advance the date.

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

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

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Battery Replacement and Maintenance

• Replace the battery with an SR920SW silver oxide battery or equivalent.

• Battery life typically lasts 2 to 3 years, depending on usage and conditions.

• It is recommended to have battery replacement performed by a professional to maintain water resistance and proper sealing.

• No special reset is needed after battery replacement, but verify and adjust the time and date settings.

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Maintenance Recommendations

• The 7N82A is fully electronic and requires no mechanical lubrication.

• Avoid exposing the watch to strong magnetic fields, shocks, and extreme temperatures to maintain accuracy and durability.

• Clean the watch regularly to preserve appearance and functionality.

• Pressure testing is advised for water-resistant models, especially after servicing or battery replacement.

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Watches Featuring the 7N82A

The 7N82A caliber is featured in:

• Seiko quartz analog watches produced in the late 1990s and early 2000s.

• Models prioritizing dependable timekeeping with a practical date function.

• Watches designed for durability and everyday use.

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Summary Table

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Conclusion

The Seiko 7N82A quartz movement offers precise and reliable analog timekeeping complemented by a straightforward date display. Its efficient power consumption, low maintenance, and solid construction make it an excellent choice for everyday watches. The 7N82A continues Seiko’s tradition of producing high-quality quartz calibers that balance accuracy, practicality, and durability within a classic analog package.