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A. Schild (AS) Calibre 1635 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1635 is a vintage Swiss automatic mechanical movement known for its compact size, reliability, and precise automatic winding system. This calibre, measuring about 7 lignes, features 21 jewels and is equipped with Incabloc shock protection. It’s prized among collectors and watchmakers restoring mid-20th-century Swiss automatic watches.
Key Technical Highlights
Calibre: AS 1635
Movement Type: Automatic, self-winding mechanical
Diameter: Approximately 7 lignes (about 15.56 mm)
Jewels: 21 synthetic ruby jewels
Shock Protection: Incabloc
Functions: Hours, minutes, automatic winding
Characteristics: Compact size, robust automatic winding, and shock resistance
Common Spare Parts and Components
Mainspring and Barrel: Essential for energy storage; replacements must match original specifications for consistent power delivery.
Balance Wheel and Balance Staff: Critical for accurate timekeeping and shock absorption; exact fit and quality are vital.
Rotor Assembly and Bearings: Central for automatic winding; worn rotor axles or bearings require precise replacement for smooth winding.
Pallet Fork and Escape Wheel: Wear-prone escapement parts; original or high-quality new-old-stock (NOS) parts recommended.
Gear Train Wheels: Includes minute, third, and fourth wheels often sourced from donor movements or NOS inventory due to wear.
Setting Mechanism (Stem, Crown, Levers, Springs): Must fit precisely to ensure reliable winding and setting.
Jewels: Synthetic ruby bearings positioned to reduce friction; replacements must match the original layout for durability.
Hands and Dial: Period-correct parts maintain vintage authenticity and collector value.
Sourcing and Maintenance Tips
Use original, NOS, or donor parts specifically marked for AS 1635 to guarantee compatibility and authenticity.
Handle all delicate components, especially the balance and rotor assemblies, with care during servicing.
Employ modern synthetic watch oils sparingly and follow vintage lubrication guidelines for optimal longevity.
Always verify the calibre number stamped on the main plate before ordering parts to avoid compatibility issues.
Why AS 1635 Spare Parts Matter
Authentic spare parts maintain the calibre’s accuracy, automatic winding reliability, and vintage character.
Proper restoration preserves both the mechanical integrity and collector appeal of these compact Swiss automatic movements.
The documented design facilitates sourcing and expert servicing within the vintage watchmaker community.
Maintaining the A. Schild AS 1635 calibre with genuine, high-quality spare parts is essential to keep these classic automatic movements running reliably and preserving their historic Swiss watchmaking heritage.