Seiko 6110A Technical Guide

Overview

The Seiko 6110A is a vintage manual-winding mechanical movement produced in the early 1960s. It belongs to Seiko’s 61 series of calibers, recognized for their precision and reliability. The 6110A movement features a simple and elegant design, powering many dress watches of its time. It is known for its durable construction and dependable timekeeping.

Specifications

• Caliber: 6110A

• Movement Type: Manual winding mechanical

• Jewels: 17 synthetic rubies

• Frequency: 18,000 vibrations per hour (2.5 Hz)

• Power Reserve: Approximately 40 to 45 hours

• Functions: Hours, minutes, central seconds

• Diameter: Approximately 26.5 mm

• Thickness: Approximately 3.7 mm

Movement Architecture and Components

Mainspring and Barrel

The mainspring stores energy when wound manually via the crown, powering the watch for about 40 to 45 hours.

Gear Train

Transmits energy from the mainspring barrel to the escapement and hands through the center, third, and fourth wheels.

Escapement

Employs a Swiss lever escapement to regulate the release of energy, maintaining precise timing.

Balance Wheel and Hairspring

Oscillates at 18,000 vibrations per hour, governing the accuracy of the movement.

Operation

The Seiko 6110A movement functions by winding the crown, which tightens the mainspring. The stored energy is released through the gear train to the escapement, which transfers impulses to the balance wheel. The balance wheel oscillates to regulate timekeeping, while the gear train moves the hands smoothly.

Servicing and Maintenance

• Lubrication: Key lubrication points include the mainspring barrel, gear pivots, escapement jewels, and balance staff pivots.

• Common Issues: Mainspring fatigue, dried lubricants, and balance staff damage can affect performance.

• Maintenance Interval: Recommended servicing every 3 to 5 years, including cleaning, lubrication, and timing adjustment.

Summary

The Seiko 6110A is a reliable and well-built manual-winding movement known for its classic design and durable construction. It remains popular among vintage Seiko collectors for its smooth operation and accurate timekeeping. Proper care and maintenance will ensure its longevity and continued precision.