A. Schild (AS) Calibre 1902 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1902 is a vintage Swiss automatic mechanical movement produced primarily around the late 1960s to early 1970s. It is known for its reliable performance, practical complications including sweep seconds and day-date display with quickset functionality, and robust build quality. This calibre is favored by collectors and watchmakers for restoring classic automatic wristwatches.
Key Technical Highlights
Calibre: AS 1902
Movement Type: Automatic, mechanical with sweep seconds
Diameter: 26 mm (11.5 lignes)
Height: 5.2 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, day and date complications with quickset by repeated crown pushing
Shock Protection: Vintage anti-shock system (commonly Incabloc)
Lift Angle: 52°
Self-Winding: Sophisticated excenter self-winding mechanism with single gear stage
Common Spare Parts and Components
Mainspring and Barrel: Original or new-old-stock (NOS) mainsprings recommended for steady power delivery and longevity.
Balance Wheel and Balance Staff: Precision components vital for accurate timekeeping and shock resistance; parts must fit precisely for reliability.
Rotor Assembly and Bearings: Crucial for efficient automatic winding; worn or damaged components need genuine or NOS replacements.
Pallet Fork and Escape Wheel: Escapement parts prone to wear; sourcing authentic parts ensures smooth operation.
Gear Train Wheels (Minute, Third, Fourth): Often replaced due to wear; sourced from donor movements or NOS stock.
Setting Mechanism (Stem, Crown, Levers, Springs): Accurate fitting parts necessary for smooth winding, time, day, and date settings.
Jewels: Synthetic ruby bearings positioned to reduce friction; replacements must precisely match the original layout.
Hands and Dial Components: Period-correct parts maintain vintage authenticity and collector value.
Sourcing and Maintenance Tips
Use original, NOS, or donor parts specifically marked for AS 1902 to ensure compatibility and preserve movement integrity.
Handle delicate parts such as balance assemblies and escapement components with care during servicing.
Apply modern synthetic watch oils sparingly following vintage lubrication standards to optimize performance and longevity.
Always verify the calibre number stamped on the main plate before ordering parts to avoid mismatches.
Donor AS 1902 movements are valuable sources for rare or worn components.
Why AS 1902 Spare Parts Matter
Genuine parts preserve the calibre’s accuracy, mechanical reliability, and efficient automatic winding, 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 expert servicing and efficient parts sourcing.
Maintaining the A. Schild AS 1902 calibre with quality, authentic spare parts is crucial for ensuring these vintage automatics continue to perform reliably 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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