EB-Bettlach 8503 Watch Spare Parts: Essential Guide for Collectors and Watchmakers
The EB-Bettlach 8503 is a Swiss manual wind watch movement, developed in the mid-1970s as a rational, cost-efficient calibre. With a case size of 11.5 lignes (26.4 mm), a frequency of 21,600 vibrations per hour, and 17 ruby bearings, this pin lever movement is notable for its pillar construction and riveted metal sheet bridges—a design that made it largely disposable and difficult to repair. Despite its minimal appearance, the 8503 features robust engineering for its class and era, making its genuine spare parts crucial for restoration and maintenance.
Key Technical Specifications
Calibre: EB-Bettlach 8503-76
Type: Manual wind, pin lever escapement
Size: 11.5 lignes (26.4 mm)
Frequency: 21,600 vibrations per hour
Jewels: 17 (ruby bearings)
Lift Angle: 45°
Shock Protection: Novodiac
Era: Launched 1976, pillar construction, disposable design
Common Spare Parts
Balance Assembly & Shock Protection: Flat ring balance with Novodiac shock protection
Mainspring & Barrel: Provides steady power for operation
Winding Stem & Crown: Unique crown wheel and minimal winding system; special split winding stems
Ratchet Wheel & Click: Special loose-mount ratchet wheel for efficient winding
Gear Train Components: Robust gears and pinion wheels for accurate timekeeping
Hands & Dial Parts: Sized for sweep seconds and calendar display
Case Screws & Fasteners: Secures the movement inside the watch case
Maintenance and Sourcing Tips
Confirm “8503” marking and “76” series reference for correct parts
Prefer New Old Stock (NOS) or original EB Bettlach parts, as repairs on riveted bridges are limited
Seek reliable suppliers specializing in vintage Swiss movements for authentic spares
Minimalistic construction restricts repairability—seek professional help for complex restoration
Importance of Genuine Spare Parts
Guarantees reliable timekeeping and operational safety
Maintains historical authenticity and collector appeal
Facilitates quality restoration for this unique late-era Swiss movement
Original EB-Bettlach 8503 spare parts are key to preserving the movement’s design, precision, and legacy among vintage watch collectors and professional watchmakers worldwide.
For any Watch Spare Parts inquiry, Email us for rate and availability: [email protected]
Watch Parts Enquiry
* If you are unable to fill out any of the required information fields, please type “N/A”.
Stem, Crown, Hands & Spares might be available for this movement.
Email us for rate and availability: [email protected]
Mobile/WhatsApp: +91- 9841 360 340