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A. Schild (AS) Calibre 1781 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1781 is a vintage Swiss manual-wind mechanical movement highly regarded for its precision, compact size, and classic complications. It features a sweep seconds hand and a date complication, making it popular among collectors and watchmakers restoring mid-20th-century small wristwatches. The calibre measures approximately 8.75 lignes (about 19.4 mm) in diameter, operates at a beat rate of 21,600 vibrations per hour (vph), and contains 17 synthetic ruby jewels.
Key Technical Highlights
Calibre: AS 1781
Movement Type: Manual winding, mechanical
Diameter: 8.75 lignes (~19.4 mm)
Jewels: 17 synthetic ruby jewels
Beat Rate: 21,600 vph
Functions: Hours, minutes, sweep seconds, date
Shock Protection: Standard vintage anti-shock system (e.g., Incabloc)
Date Setting: Typically set by moving the hands between 8 PM and midnight
Common Spare Parts and Components
Mainspring and Barrel: Ensure stable power delivery that matches original engine specifications for torque and power reserve.
Balance Wheel and Balance Staff: Precision parts crucial for accurate timekeeping and shock resistance; replacements should be exact fits.
Pallet Fork and Escape Wheel: Wear-prone escapement parts; sourcing original or high-quality new-old-stock (NOS) parts maintains smooth operation.
Gear Train Wheels (Minute, Third, Fourth): Commonly replaced due to wear or damage; typically procured from donor movements or NOS inventory.
Setting Mechanism (Stem, Crown, Levers, Springs): Accurate fitting parts essential for smooth winding, time setting, and date adjustment.
Jewels: Synthetic ruby bearings arranged to reduce friction; replacements must match the original layout.
Hands and Dial Components: Period-correct parts to preserve vintage authenticity and collector appeal.
Sourcing and Maintenance Tips
Use original, NOS, or donor parts clearly marked for AS 1781 to maintain compatibility and preserve movement quality.
Handle delicate elements—especially balance, escapement, and setting mechanisms—with care during servicing.
Apply modern synthetic watch oils sparingly, following vintage lubrication standards for longevity and performance.
Always verify the calibre number stamped on the movement main plate before ordering parts to avoid mismatches.
Donor AS 1781 movements are valuable sources for rare or worn components.
Why AS 1781 Spare Parts Matter
Genuine spare parts preserve the calibre’s accuracy, mechanical reliability, and vintage character essential for dependable function.
Authentic restoration with original components maintains the historical significance and collector value of these classic Swiss manual-wind watches.
Detailed technical documentation and a supportive watchmaker community enable efficient parts sourcing and expert repair.
Maintaining the A. Schild AS 1781 calibre with quality spare parts is essential for ensuring these refined vintage manual-wind watches continue performing reliably while upholding their important place in Swiss horology.