A. Schild (AS) Calibre 1903 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1903 is a vintage Swiss automatic mechanical movement appreciated for its reliable performance, practical complications, and robust construction. Produced primarily around the 1970s, this calibre features automatic winding with a sweep second and a date complication, which is set by changing the time between 8 PM and midnight, offering a practical quickset date functionality.
Key Technical Highlights
Calibre: AS 1903
Movement Type: Automatic, mechanical with sweep seconds
Diameter: 25.60 mm (11.5 lignes)
Height: Approximately 5.20 mm
Jewels: 17, 21, or 25 synthetic ruby jewels
Beat Rate: 21,600 vibrations per hour (3 Hz)
Power Reserve: Approximately 44 hours
Functions: Hours, minutes, sweep seconds, date (set by changing time between 20:00 and 24:00)
Shock Protection: Vintage anti-shock system (commonly Incabloc or equivalent)
Rotor: Ball-bearing type for smooth and efficient automatic winding
Lift Angle: Approximately 52°
Common Spare Parts and Components
Mainspring and Barrel: Key for consistent power delivery; original or new-old-stock (NOS) mainsprings ensure accurate torque and durability.
Balance Wheel and Balance Staff: Precision parts critical for accurate timekeeping and shock resistance; must be exact fit for reliable operation.
Rotor Assembly and Bearings: Crucial for efficient automatic winding; worn components require genuine or high-quality NOS replacement parts.
Pallet Fork and Escape Wheel: Wear-prone escapement parts; sourcing original or NOS components maintains smooth and reliable operation.
Gear Train Wheels (Minute, Third, Fourth): Commonly replaced due to wear; usually sourced from donor movements or NOS stock.
Setting Mechanism (Stem, Crown, Levers, Springs): Precise fitting parts necessary for smooth winding, time setting, and date adjustments. Winding stem Part No. 401 is compatible.
Jewels: Synthetic ruby bearings arranged to minimize friction; replacements must match original layout to preserve movement integrity.
Hands and Dial Components: Period-correct parts maintain vintage authenticity and enhance collector appeal.
Sourcing and Maintenance Tips
Always use original, NOS, or donor parts specifically designated for AS 1903 to guarantee compatibility and preserve movement quality.
Handle delicate components such as balance assemblies, escapement parts, and rotor carefully during servicing to avoid damage.
Apply modern synthetic watch oils sparingly, following vintage lubrication protocols for optimal longevity and performance.
Verify the calibre number stamped on the movement main plate before ordering parts to avoid mismatches or incompatibilities.
Donor AS 1903 movements provide valuable sources for rare or worn components and parts.
Why AS 1903 Spare Parts Matter
Genuine parts preserve the calibre’s accuracy, reliable automatic winding, and efficient date function, vital for dependable vintage watch operation.
Proper restoration with authentic components supports the historical significance and collector value of these classic Swiss automatic wristwatches.
Well-documented technical data and an active watchmaker community help ensure efficient parts sourcing and expert repairs.
Maintaining the A. Schild AS 1903 calibre with high-quality, authentic spare parts is essential to keeping these vintage automatics running smoothly while honoring their place in Swiss horological heritage.
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Stem, Crown, Hands & Spares might be available for this movement.
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