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A. Schild (AS) Calibre 1820 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1820 is a vintage Swiss automatic movement noted for its robust construction, proven reliability, and inclusion of sweep seconds, day, and date complications. Frequently found in mid-20th-century wristwatches, restoring this calibre demands attention to detail and precise sourcing of specialty parts.
Key Technical Highlights
Calibre: AS 1820
Movement Type: Automatic, mechanical
Diameter: 11.5 lignes (25.60mm)
Height: 4.70mm
Jewels: 17, 21, or 25 synthetic ruby jewels
Beat Rate: 18,000 vibrations per hour (vph)
Power Reserve: Approximately 40–42 hours
Functions: Hours, minutes, sweep seconds, day (set by ±24h), date (set by changing 20:00–24:00)
Shock Protection: Incabloc or similar vintage system
Lift Angle: 52°
Rotor: Ball-bearing style for efficient automatic winding
Common Spare Parts and Components
Mainspring and Barrel: Critical for stable power delivery; exact replacements (including NOS) are available and ensure long-running reliability.
Balance Wheel and Balance Staff: Precision, shock-protected parts vital for timekeeping; matching genuine components is essential.
Rotor Assembly and Bearings: Central to dependable automatic winding; worn or damaged rotors should be replaced with compatible original or new-old-stock units.
Pallet Fork and Escape Wheel: Wear-prone escapement parts; use original or high-grade NOS for smooth function and longevity.
Gear Train Wheels (Minute, Third, Fourth): Frequently replaced due to wear or damage; sourced from donor movements or NOS inventories.
Winding Stem (Part No. 401): The official Swiss-made stem for the AS 1820; suited for seamless fit and operation of winding, setting, and quickset features.
Setting Mechanism (Crown, Levers, Springs): Must be original spec for precise winding, time, and calendar adjustments.
Jewels: Replacement synthetic ruby bearings need to match the original configuration and placement.
Hands and Dial Components: Period-appropriate pieces preserve authenticity and collector value.
Sourcing and Maintenance Tips
Select original, NOS, or properly marked donor parts for the AS 1820 to ensure quality and fit.
Handle delicate components, especially the balance, escapement, and rotor assemblies, with care during service.
Use synthetic watch oils sparingly, adhering to vintage lubrication practices to safeguard longevity and optimal function.
Always confirm the calibre number stamped on the main plate before ordering any parts for perfect compatibility.
Donor AS 1820 movements are a valuable resource for rare or worn pieces.
Why AS 1820 Spare Parts Matter
Authentic, well-matched parts protect the calibre’s precision, durability, and mechanical reliability.
Correct restoration with genuine components preserves the historical and collectible significance of these Swiss automatics.
Active vintage watchmaker communities and technical documentation support effective parts sourcing and skilled repairs.
Maintaining the A. Schild AS 1820 movement with quality spare parts is essential for keeping these vintage automatics performing reliably and honoring their place in Swiss horological history.