ETA 2671-1497 Movement Ball Bearing

Product Description

The ETA 2671-1497 Movement Ball Bearing is a genuine Swiss-made component for the ETA 2671 automatic movement family, with part number 2671-1497, Article 31-2. The ball bearing supports the oscillating weight (rotor), enabling smooth, low-friction rotation for efficient bidirectional self-winding. As the ETA 2671 is a compact 17.2mm caliber widely used in ladies’ watches, the ball bearing is a critical component for maintaining automatic winding performance and the movement’s ~38-hour power reserve.

Features & Function

• Genuine ETA part – authentic Swiss-made component for the ETA 2671 movement

• Ball bearing system – supports the rotor with 5-ball bearing for smooth rotation and reduced friction

• Bidirectional winding support – enables efficient self-winding regardless of rotor direction

• Essential for power reserve – direct impact on winding efficiency and the ~38-hour power reserve

• Precision-engineered – manufactured to ETA’s original specifications

Specifications

• Part Number: 2671-1497 / 1497

• Article Number: 31-2

• Compatible Movement: ETA 2671

• Movement Diameter: 17.2 mm (7¾”’)

• Movement Height: 4.80 mm

• Jewels: 17/21/25 (varies by version)

• Frequency: 28,800 vph (4 Hz)

• Power Reserve: ~38 hours

• Rotor Type: Ball bearing (5 balls)

• Winding Direction: Bidirectional

• Origin: Switzerland (ETA factory part)

• Condition: Brand new

Applications

• Service and overhaul of ETA 2671 movements

• Automatic winding repair – replacing worn, noisy, or seized rotor bearings

• Rotor restoration – ensuring smooth and efficient self-winding performance

• Suitable for professional watchmakers and experienced repair technicians

FAQs

1. Is this a genuine ETA part?

Yes, this is a genuine ETA factory part (reference 2671-1497), made in Switzerland. The ETA 2671 is a 17.2 mm automatic movement widely used in ladies’ watches from brands including Tissot, Mido, Longines, and Tudor.

2. What is the function of the ball bearing in the ETA 2671 movement?

The ball bearing supports the automatic rotor, allowing it to rotate with minimal friction. The ETA 2671 features a 5-ball bearing rotor with bidirectional winding, efficiently winding the mainspring regardless of rotor direction.

3. What are the signs that the ball bearing needs replacement?

Common signs include grinding or rattling noise from the rotor, reduced winding efficiency, rough rotor rotation, or visible wear/damage during inspection. Experienced watchmakers note that worn ball bearings are a common cause of automatic winding issues in the ETA 2671.

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