The ETA 2391 is a classic manual-wind watch movement produced by ETA, known for its slim profile and reliable performance in vintage timepieces. Designed for small to mid-sized watches, it remains a favorite among collectors and watchmakers for its straightforward construction and historical significance.
Key Specifications
Movement Type: Manual-wind, center seconds
Diameter: Approximately 26mm
Height: Just 3.6mm, making it one of the slimmer manual movements
Jewels: 17 jewels
Frequency: 18,000 vibrations per hour (A/h)
Power Reserve: Around 48 hours
Notable Features
The ETA 2391 features a simple hour, minute, and center seconds display, without complications.
Many versions were produced with variations in finishing, balance design, and shock protection, depending on the brand and era.
Some models, such as those signed by Wyler, use an “S”-shaped balance arm, which theoretically offers better shock resistance by allowing flexibility during impact.
Usage and Legacy
This movement was widely used by various brands in the mid-20th century, often found in vintage dress watches.
Its slimness and reliability made it suitable for elegant, thin cases, and it remains a sought-after movement for restoration projects.
Bulletin Points
Manual-wind movement, center seconds, 17 jewels
Diameter: 26mm, Height: 3.6mm
Frequency: 18,000 A/h, Power reserve: 48 hours
Simple, robust design, used by multiple brands
Often found in vintage dress watches, popular for restoration
The ETA 2391 continues to be a respected movement in horology for its simplicity, slim build, and enduring appeal in vintage watch circles.
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Watch Parts Enquiry
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Stem, Crown, Hands & Spares might be available for this movement.
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