A. Schild (AS) Calibre 1920 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1920 is a vintage Swiss automatic mechanical movement notable for its high frequency of 36,000 vibrations per hour (vph), robust build, and practical complications. Manufactured primarily in the mid-20th century, it features sweep seconds, day, and date functions with a quickset date mechanism activated by repeatedly pushing the crown. This calibre is highly valued by collectors and watchmakers restoring classic automatic wristwatches.
Key Technical Highlights
Calibre: AS 1920
Movement Type: Automatic, mechanical with sweep seconds
Diameter: 28.00 mm (12.5 lignes)
Height: 5.20 mm
Jewels: 17 or 25 synthetic ruby jewels
Beat Rate: 36,000 vibrations per hour (high frequency)
Power Reserve: Approximately 46 hours
Functions: Hours, minutes, sweep seconds, day, date with quickset by crown pushing
Shock Protection: Vintage anti-shock system (commonly Incabloc)
Lift Angle: Approximately 52°
Common Spare Parts and Components
Mainspring and Barrel: Original or new-old-stock (NOS) mainsprings recommended for steady torque and reliable power delivery.
Balance Wheel and Balance Staff: Precision components essential for accurate timekeeping and shock resistance; exact fitting is crucial.
Rotor Assembly and Bearings: Integral to smooth automatic winding; genuine or high-quality NOS replacements ensure longevity.
Pallet Fork and Escape Wheel: Wear-prone escapement parts; sourcing original or NOS parts maintains smooth operation.
Gear Train Wheels: Includes minute, third, and sweep second wheels; replacement parts usually sourced from donor movements or NOS stock.
Setting Mechanism (Stem, Crown, Levers, Springs): Accurate fitting parts necessary for smooth winding, time, day, and date adjustments; winding stems like Part No. 401 are compatible.
Jewels: Synthetic ruby bearings arranged to minimize friction; replacements must correspond exactly to the original layout.
Hands and Dial Components: Period-correct parts preserve vintage authenticity and enhance collector appeal.
Date and Day Complications: Components such as date indicator guards, calendar driving wheels, date jumpers, unlocking yokes, and day stars are vital for reliable calendar function.
Sourcing and Maintenance Tips
Use original, NOS, or donor parts specifically designated for the AS 1920 calibre to ensure compatibility and preserve movement quality.
Handle delicate components like balance assemblies, escapement parts, and rotor assemblies with care during servicing.
Apply modern synthetic watch oils sparingly, adhering to vintage lubrication standards to optimize longevity and performance.
Always verify the calibre number stamped on the main plate before ordering parts to avoid incompatibilities.
Donor AS 1920 movements are invaluable sources of rare or worn components.
Why AS 1920 Spare Parts Matter
Genuine parts preserve the calibre’s accuracy, high-frequency performance, reliable automatic winding, and smooth calendar functions, essential for dependable vintage watch operation.
Proper restoration with authentic components maintains the historical significance and collector value of these classic Swiss automatic wristwatches.
Detailed technical documentation and an active watchmaker community support efficient parts sourcing and expert repairs.
Maintaining the A. Schild AS 1920 calibre with high-quality, authentic spare parts is crucial for ensuring these high-frequency vintage automatics continue to run smoothly and honor their distinguished place in Swiss horological heritage.
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Stem, Crown, Hands & Spares might be available for this movement.
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