A. Schild (AS) Calibre 1931 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1931 is a vintage Swiss manual-winding mechanical movement highly regarded for its reliability, classic design, and practical features. Primarily produced in the mid-20th century, this calibre is known for its sweep second, date complication, and a unique mechanical alarm function, making it a distinctive choice among collectors and watchmakers restoring classic vintage timepieces.
Key Technical Highlights
Calibre: AS 1931
Movement Type: Manual winding, mechanical with sweep seconds, date, and mechanical alarm
Diameter: 25.60 mm (11.5 lignes)
Height: Approximately 5.75 mm
Jewels: 17 synthetic ruby jewels
Beat Rate: 21,600 vibrations per hour (3 Hz)
Power Reserve: About 50 hours
Alarm Duration: Approximately 12 seconds
Lift Angle: Around 52°
Additional Functions: Date quickset by changing time and mechanical alarm actuation
Common Spare Parts and Components
Mainspring and Barrel: Original or NOS mainsprings and barrels are recommended for consistent power delivery and maintaining alarm functionality.
Balance Wheel and Balance Staff: Precision parts critical for accurate timekeeping and shock resistance; exact fitting is required.
Alarm Mechanism Components: Specialized parts like alarm spring, hammer, and activating levers essential for proper alarm operation.
Pallet Fork and Escape Wheel: Wear-prone escapement parts; sourcing original or NOS ensures smooth operation.
Gear Train Wheels (Minute, Third, Fourth): Often replaced due to wear; may be sourced from donor movements or NOS stock.
Setting Mechanism (Stem, Crown, Levers, Springs): Accurate fitting components ensure smooth winding, time setting, date adjustment, and alarm activation.
Jewels: Synthetic ruby bearings designed to reduce friction; replacements must strictly conform to original design.
Hands and Dial Components: Period-correct parts maintain the vintage authenticity and enhance collector value.
Sourcing and Maintenance Tips
Use original, NOS, or donor parts specifically marked for AS 1931 to guarantee compatibility and preserve movement integrity.
Exercise caution when handling delicate components such as the alarm mechanism, balance assembly, escapement parts, and setting system during servicing.
Apply modern synthetic watch oils sparingly following vintage lubrication practices to ensure longevity and optimal functionality.
Verify the calibre number stamped on the movement main plate before ordering parts to avoid incompatibility.
Donor AS 1931 movements are invaluable sources for rare or worn components, especially alarm-related parts.
Why AS 1931 Spare Parts Matter
Genuine parts ensure the calibre’s accuracy, mechanical reliability, smooth manual winding, and uniquely, its mechanical alarm functionality, critical for dependable vintage watch performance.
Proper restoration with authentic components preserves the historical significance and collector value of these original Swiss manual-wind alarm watches.
Extensive technical documentation and a dedicated watchmaker community support efficient parts sourcing and expert servicing.
Maintaining the A. Schild AS 1931 calibre with high-quality, authentic spare parts is essential for ensuring these vintage mechanical alarm watches continue to run 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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