EB-Bettlach 8157 Watch Spare Parts: Detailed Guide for Collectors and Watchmakers
The EB-Bettlach 8157 is a Swiss automatic watch movement manufactured by Ebauches Bettlach, notable for its reliable construction and precise mechanics. Featuring 17 to 21 jewels and operating at 18,000 vibrations per hour (vph), this calibre has a power reserve of about 37 hours. It includes a ball-bearing rotor and reverse setting date quickset, based on the manual wind calibres AS 1687/1688, making it a sought-after movement among collectors and restorers since its early 1970s origin.
Key Technical Specifications
Calibre: EB-Bettlach 8157
Type: Automatic with ball-bearing rotor
Jewels: 17 to 21
Frequency: 18,000 vph
Power Reserve: Approximately 37 hours
Lift Angle: 49°
Diameter: 19.7 mm (8.75 lignes)
Functions: Hours, minutes, sweep seconds, date with reverse quickset
Era: Early 1970s onward
Common Spare Parts
Balance Assembly & Staff: Crucial for maintaining stable oscillations and time accuracy
Mainspring & Barrel: Provides power for sustained movement operation
Rotor & Ball Bearings: Essential for smooth and reliable automatic winding
Setting Stem & Crown: Specific to the calibre for precise winding and setting functions
Gear Train Wheels: Includes center, third, fourth, and escape wheels designed for durability
Pallet Fork & Escape Wheel: Integral to the Swiss lever escapement mechanism
Jewels & Bearings: Synthetic rubies reduce friction and wear on pivotal components
Date Quickset Components: Facilitate efficient date adjustment via reverse setting
Hands & Dial Parts: Appropriately sized for vintage wristwatches
Case Screws & Clamps: Secure the movement inside the watch case
Maintenance and Sourcing Tips
Always confirm the 8157 calibre marking for correct part matching
Obtain New Old Stock (NOS) or authentic EB parts from specialized suppliers
Routine servicing recommended to ensure longevity and performance
Importance of Genuine Spare Parts
Maintains accurate and reliable timekeeping
Preserves the historical value and originality of the movement
Supports quality restoration and functional longevity
Acquiring genuine EB-Bettlach 8157 spare parts is essential for sustaining the functional integrity and heritage of these admired Swiss automatic movements.
For any Watch Spare Parts inquiry, Email us for rate and availability: [email protected]
Watch Parts Enquiry
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Stem, Crown, Hands & Spares might be available for this movement.
Email us for rate and availability: [email protected]
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