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A. Schild (AS) Calibre 1511 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1511 is a vintage Swiss manual-wind mechanical movement famed for its robust build, precision, and reliability. This calibre is closely related to AS 1510, sharing essentially identical parts and specifications. Notably, the AS 1511 powered the highly accurate Omega Marine Chronometer, certified by the Besançon Institute for exceptional chronometric accuracy.
Key Technical Highlights
Calibre: AS 1511
Movement Type: Manual winding, mechanical
Diameter: 30.00 mm (13.5 lignes)
Height: 3.80 mm
Jewels: 17 synthetic ruby jewels
Beat Rate: 18,000 vibrations per hour (vph)
Power Reserve: Approximately 41 hours
Functions: Hours, minutes, sub-seconds
Notable Use: Omega Marine Chronometer, certified for exceptional precision
Common Spare Parts and Service Needs
Mainspring and Barrel: Vital for power delivery; replacement parts must match original dimensions exactly for consistent torque and longevity.
Balance Wheel and Balance Staff: Precision parts critical for accurate timekeeping; delicate components that must fit exactly to ensure proper shock resistance.
Pallet Fork and Escape Wheel: Escapement components prone to wear; original or high-quality new-old-stock (NOS) parts are recommended for smooth operation.
Gear Train Wheels (Minute, Third, Fourth): Often experience wear; typically sourced from donor movements or NOS stock.
Setting Mechanism (Stem, Crown, Levers, Springs): Must fit precisely to ensure reliable winding and time setting.
Jewels: Synthetic ruby bearings positioned to reduce friction; replacements must correspond perfectly to the movement’s original configuration.
Hands and Dial: Period-correct parts enhance authenticity and maintain collector value.
Sourcing and Maintenance Tips
Use original, NOS, or donor parts marked specifically for AS 1511 or the fully interchangeable AS 1510 to guarantee compatibility and authenticity.
Handle balance and escapement components with care owing to their delicacy and the movement’s precision standards.
Apply modern synthetic watch oils sparingly, following vintage lubrication guidelines to optimize longevity and performance.
Always verify the calibre number stamped on the main plate to prevent ordering incompatible parts.
Why AS 1511 Spare Parts Matter
Authentic parts preserve the calibre’s renowned precision and reliability, essential for chronometer-level performance.
Proper restoration maintains the historical significance and collector appeal of iconic watches like the Omega Marine Chronometer.
The well-documented AS 1511 design facilitates sourcing and expert servicing support within the vintage watchmaker community.
Maintaining the A. Schild AS 1511 calibre with quality spare parts ensures these historically important, high-precision manual-wind watches continue to operate reliably and authentically.