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A. Schild (AS) Calibre 1780 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1780 is a vintage Swiss manual-wind mechanical movement well-regarded for its compact size, high-beat accuracy, and reliable construction. It measures approximately 8.75 lignes (around 19.4 mm) in diameter and is favored for small wristwatches requiring precise timekeeping. The calibre runs at a beat rate of 21,600 vibrations per hour (vph) and typically features 17 synthetic ruby jewels with a power reserve of about 38 hours.
Key Technical Highlights
Calibre: AS 1780
Movement Type: Manual winding, mechanical with sweep seconds
Diameter: 8.75 lignes (~19.4 mm)
Beat Rate: 21,600 vph
Jewels: 17 synthetic ruby jewels (sometimes 21 in variants)
Power Reserve: Approximately 38 hours
Shock Protection: Incabloc anti-shock system
Balance: Nickel anular balance with clockwise hairspring, moveable stud
Lift Angle: 52°
Functions: Hours, minutes, sweep seconds
Common Spare Parts and Components
Mainspring and Barrel: Essential for consistent power and torque; replacement parts should match original specs for reliable function.
Balance Wheel and Balance Staff: Precision components critical for maintaining accurate timekeeping and shock resistance; require exact fit and quality replacements.
Pallet Fork and Escape Wheel: Wear-prone escapement parts; optimal to use original or high-quality new-old-stock (NOS) components.
Gear Train Wheels (Minute, Third, Fourth): Frequently replaced due to wear; typically sourced from donor movements or NOS stock.
Setting Mechanism (Stem, Crown, Levers, Springs): Require accurate fitting to ensure smooth winding, time setting, and hand adjustment.
Jewels: Synthetic ruby bearings arranged to minimize friction; replacements must follow the original layout.
Hands and Dial Components: Period-correct parts help preserve vintage authenticity and collector value.
Sourcing and Maintenance Tips
Use original, NOS, or donor parts specifically marked for AS 1780 to ensure proper compatibility and maintain movement integrity.
Handle fragile components, particularly balance assembly and escapement parts, with great care during servicing.
Apply modern synthetic watch oils sparingly, adhering to vintage lubrication standards for maximum longevity and performance.
Always verify the calibre number stamped on the main plate before ordering parts to avoid mismatches.
Donor AS 1780 movements can provide valuable sources for rare or worn components.
Why AS 1780 Spare Parts Matter
Authentic parts preserve the calibre’s high-beat accuracy, reliability, and mechanical durability, key for precise performance.
Proper restoration with genuine components sustains the historical significance and collector appeal of these classic compact manual-wind watches.
The detailed technical documentation and active watchmaker community facilitate efficient parts sourcing and expert repair.
Maintaining the A. Schild AS 1780 calibre with quality spare parts ensures these refined vintage manual-wind movements continue to perform reliably while honoring their heritage in Swiss horology.