The Seiko 7N82C is a robust and accurate quartz analog movement featuring a practical date complication. Launched in the late 1990s, the 7N82C exemplifies Seiko’s commitment to producing reliable, durable, and user-friendly quartz calibers. This movement is widely used in everyday watches and is appreciated for its precision, power efficiency, and ease of maintenance.

Technical Specifications

• Caliber Number: 7N82C

• Movement Type: Quartz (Analog)

• Display:

  • Hours, minutes, 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: Around 2 to 3 years

• Jewels: None (fully electronic quartz movement)

• Crown Positions:

  • Position 0: Normal operation

  • Position 1: Date adjustment

  • Position 2: Time adjustment

Key Features

Precise Timekeeping

The 7N82C utilizes a quartz crystal oscillator regulated by an integrated circuit, ensuring accurate timekeeping with an average deviation of ±15 seconds per month.

Date Display

This movement features a date complication displayed through a window at 3 o’clock, allowing easy reading and manual adjustment.

Efficient Power Consumption

Powered by an SR920SW silver oxide battery, the 7N82C is designed to consume minimal energy, resulting in a typical battery life of two to three years.

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 timekeeping.

Date Setting

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

2. Rotate the crown clockwise to advance the date.

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

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

Battery Replacement and Maintenance

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

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

• Professional battery replacement is recommended to maintain water resistance and seal integrity.

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

Maintenance Recommendations

• The 7N82C is fully electronic and requires no lubrication.

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

• Clean the watch regularly to preserve its appearance and functionality.

• Water-resistant models should undergo periodic pressure testing, especially after servicing or battery changes.

Watches Featuring the 7N82C

The 7N82C caliber is found in:

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

• Models emphasizing dependable timekeeping with a straightforward date function.

• Watches designed for durability and everyday use.

Summary Table

Conclusion

The Seiko 7N82C quartz movement offers precise and reliable analog timekeeping enhanced by a simple date display. Its efficient power consumption, ease of maintenance, and solid build quality make it an excellent choice for everyday watches. The 7N82C continues Seiko’s legacy of producing high-quality quartz calibers that balance accuracy, practicality, and durability within a classic analog package.