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A. Schild (AS) Calibre 1788 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1788 is a vintage Swiss automatic mechanical movement appreciated for its reliable automatic winding system, compact size, and classic functions. It is commonly found in mid-20th century wristwatches and known for its robustness and mechanical accuracy.
Key Technical Highlights
Calibre: AS 1788
Movement Type: Automatic, mechanical
Diameter: Approximately 8.75 lignes (~19.4 mm)
Height: Around 4.9 mm (typical for similar calibres)
Jewels: 17 or 21 synthetic ruby jewels
Beat Rate: 18,000 vibrations per hour (vph)
Power Reserve: Approximately 38 hours
Functions: Hours, minutes, sweep seconds, automatic winding
Shock Protection: Vintage anti-shock systems like Incabloc
Notable: Features efficient automatic winding with a ball-bearing rotor system
Common Spare Parts and Components
Mainspring and Barrel: Essential for consistent and reliable power delivery; NOS or original mainsprings ensure proper torque and durability.
Balance Wheel and Balance Staff: Precision parts vital for accurate timekeeping and shock resistance; must fit perfectly with appropriate shock protection.
Rotor Assembly and Bearings: Core to automatic winding efficiency; worn rotors and bearings need quality replacement parts or NOS components for smooth operation.
Pallet Fork and Escape Wheel: Critical escapement components susceptible to wear; sourcing genuine or high-quality NOS parts preserves smooth motion transfer.
Gear Train Wheels (Minute, Third, Fourth): Replaceable parts commonly sourced from donor movements or NOS stock due to wear or damage.
Setting Mechanism (Stem, Crown, Levers, Springs): Must fit precisely for reliable winding, time setting, and hand adjustments. Swiss-made winding stems are generally available.
Jewels: Synthetic ruby bearings arranged to minimize friction; replacements must correspond exactly to original layout.
Hands and Dial Components: Period-appropriate parts maintain vintage authenticity and add collector appeal.
Sourcing and Maintenance Tips
Use original, NOS, or donor parts specifically marked for AS 1788 to ensure compatibility and maintain the movement’s integrity.
Handle delicate components such as the balance wheel, escapement, and rotor assembly carefully during servicing to avoid damage.
Apply modern synthetic watch oils sparingly, adhering to vintage lubrication standards to optimize longevity and functionality.
Always confirm the calibre number stamped on the main plate before ordering parts to prevent mismatches.
Donor AS 1788 movements serve as valuable sources for hard-to-find or worn components.
Why AS 1788 Spare Parts Matter
Authentic parts preserve the calibre’s accuracy, automatic winding efficiency, and mechanical durability, crucial for reliable everyday use.
Proper servicing with genuine components helps maintain the historical significance and collectible value of these classic Swiss automatic watches.
The detailed technical design and active watchmaker community facilitate trusted parts sourcing and expert repairs.
Maintaining the A. Schild AS 1788 calibre with quality spare parts is essential for ensuring these vintage automatic movements continue to perform smoothly, preserving their important place in horological history.