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A. Schild (AS) Calibre 1775 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1775 is a vintage Swiss automatic mechanical movement, recognized for being the smallest industrially manufactured automatic calibre by diameter. Developed and used from 1967 onwards, it is valued for its compact design, precise automatic winding, and reliable performance in small wristwatches.
Key Technical Highlights
Calibre: AS 1775
Movement Type: Automatic, mechanical
Diameter: Notably small, the smallest industrial automatic movement diameter
Beat Rate: Typically 18,000 vibrations per hour (vph)
Jewels: Commonly equipped with synthetic ruby jewels for reduced friction and durability
Functions: Hours, minutes, sweep seconds, automatic winding
Notable Features: Compact size ideal for slim wristwatches
Common Spare Parts and Components
Mainspring and Barrel: Must match original specifications to ensure consistent torque and reliable power reserve.
Balance Wheel and Balance Staff: Precision parts critical for timing accuracy and shock resistance; must fit exactly for smooth function.
Rotor Assembly and Bearings: Essential for the automatic winding process; worn rotor parts or bearings require precise replacement for efficient performance.
Pallet Fork and Escape Wheel: Wear-prone escapement components; sourcing original or high-quality new-old-stock (NOS) parts ensures smooth operation.
Gear Train Wheels (Minute, Third, Fourth): Frequently replaced due to wear or damage; typically sourced from donor movements or NOS.
Setting Mechanism (Stem, Crown, Levers, Springs): Precise fitment required to maintain reliable winding, time setting, and hand adjustment. Winding stems for AS 1775 are available as original Swiss-made parts.
Jewels: Synthetic ruby bearings arranged to minimize friction; replacement jewels must correspond exactly to the original layout.
Hands and Dial Components: Period-correct parts preserve vintage authenticity and collector value.
Sourcing and Maintenance Tips
Use original, NOS, or donor parts clearly marked for AS 1775 to ensure compatibility and preserve movement integrity.
Handle delicate components such as balance wheel, rotor assembly, and escapement with care during servicing.
Apply modern synthetic watch oils sparingly, adhering to vintage lubrication standards for longevity and optimal performance.
Always verify the calibre number stamped on the main plate before ordering parts to avoid mismatches.
Donor AS 1775 movements are valuable sources for rare or worn spare components.
Why AS 1775 Spare Parts Matter
Authentic parts maintain the calibre’s accuracy, reliability, and automatic winding efficiency, critical for proper functionality.
Correct restoration with genuine components preserves the historical significance and collector appeal of these compact vintage automatic watches.
The detailed technical documentation and active watchmaker community facilitate precise parts sourcing and expert servicing.
Maintaining the A. Schild AS 1775 calibre with quality spare parts is essential to ensure these uniquely compact vintage automatic movements continue to perform reliably and preserve their important place in Swiss horological heritage.