A. Schild (AS) Calibre 1940 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1940 is a vintage Swiss manual-wind mechanical movement known for its precision, robust build, and practical features such as sweep seconds. Primarily produced around the mid-20th century, this calibre offers reliable performance and remains sought after by collectors and watchmakers restoring classic wristwatches.
Key Technical Highlights
Calibre: AS 1940
Movement Type: Manual winding, mechanical with sweep seconds
Diameter: Approximately 23.7 to 23.3 mm (10.5 lignes)
Height: Around 4.5 mm
Jewels: 17 synthetic ruby jewels
Beat Rate: 21,600 vibrations per hour (3 Hz)
Power Reserve: Approximately 46 hours
Lift Angle: About 52°
Functions: Hours, minutes, sweep seconds
Shock Protection: Vintage anti-shock system (likely Incabloc or equivalent)
Common Spare Parts and Components
Mainspring and Barrel: Critical for steady and reliable power delivery; original or New-Old-Stock (NOS) mainsprings are recommended for proper torque and longevity.
Balance Wheel and Balance Staff: Precision components vital for accurate timekeeping and shock absorption; exact fitting parts ensure dependable performance.
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): Common replacement parts due to wear; typically harvested from donor movements or NOS stock.
Setting Mechanism (Stem, Crown, Levers, Springs): Accurate fitting parts essential for smooth winding and time setting functions.
Jewels: Synthetic ruby bearings arranged to minimize friction; replacements must match the original layout to preserve movement integrity.
Hands and Dial Components: Period-correct parts help maintain vintage authenticity and enhance collector appeal.
Sourcing and Maintenance Tips
Use only original, NOS, or donor parts specifically designated for AS 1940 to ensure full compatibility and preserve movement quality.
Handle delicate components such as balance assemblies and escapement parts carefully during servicing to prevent damage.
Apply modern synthetic watch oils sparingly, following vintage lubrication standards for optimal longevity and performance.
Always verify the calibre number stamped on the movement main plate before ordering parts to avoid mismatches.
Donor AS 1940 movements are valuable sources for rare or worn components.
Why AS 1940 Spare Parts Matter
Genuine parts ensure the calibre’s accuracy, mechanical reliability, and smooth manual winding, essential for dependable vintage watch performance.
Restoration with authentic components preserves the historical significance and collector value of these classic Swiss manual-wind watches.
Detailed technical documentation and active watchmaker communities facilitate efficient parts sourcing and expert servicing.
Maintaining the A. Schild AS 1940 calibre with high-quality, authentic spare parts is crucial for preserving the functionality and integrity of these cherished vintage mechanical movements while honoring their place in Swiss horology heritage.
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Stem, Crown, Hands & Spares might be available for this movement.
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