A. Schild (AS) Calibre 1977 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1977 is a vintage Swiss manual-wind mechanical movement, known for its reliability and compact design. Produced primarily in the mid-20th century, this calibre is favored by collectors and watchmakers restoring classic vintage wristwatches, especially ladies’ watches due to its relatively small size.
Key Technical Highlights
Calibre: AS 1977
Movement Type: Manual winding, mechanical
Dimensions: Approximately 13.00 x 15.20 mm (shaped movement)
Height: 3.50 mm
Jewels: 17 synthetic ruby jewels
Beat Rate: 21,600 vibrations per hour (3 Hz)
Power Reserve: About 44 hours
Functions: Hours, minutes, and sweep seconds
Shock Protection: Typically equipped with Incabloc
Escapement: Lever escapement
Regulation: Classic A. Schild design with indexed regulator
Setting Mechanism: Yoke winding system, smooth winding and setting
Common Spare Parts and Components
Mainspring and Barrel: Original or new-old-stock (NOS) mainsprings are vital for steady power delivery and torque stability.
Balance Wheel and Balance Staff: Precision parts essential for accurate timekeeping and shock resistance, requiring exact fitment.
Pallet Fork and Escape Wheel: Wear-prone escapement components; sourcing genuine or NOS replacements is recommended for smooth operation.
Gear Train Wheels: Including minute, third, and fourth wheels, commonly replaced due to wear and usually sourced from donor movements or NOS stock.
Setting Mechanism (Stem, Crown, Levers, Springs): Accurate-fitting components necessary for smooth manual winding and time setting.
Jewels: Synthetic ruby bearings designed to minimize friction; exact matching replacements preserve movement integrity.
Hands and Dial Components: Period-correct parts maintain vintage authenticity and collector value.
Sourcing and Maintenance Tips
Use original, NOS, or donor parts specifically designated for AS 1977 to ensure compatibility and maintain quality.
Handle delicate components such as the balance assembly, escapement, and setting mechanisms carefully during servicing to avoid damage.
Apply modern synthetic watch lubricants sparingly, following vintage lubrication protocols for optimal longevity and performance.
Verify the calibre number stamped on the movement main plate before ordering to prevent incompatible parts.
Donor AS 1977 movements can be excellent sources for rare or worn components.
Why AS 1977 Spare Parts Matter
Genuine parts preserve the calibre’s accuracy, mechanical reliability, and smooth manual winding operation, critical for dependable vintage watch performance.
Proper restoration with authentic parts protects the historical significance and collector value of this classic Swiss manual-wind movement.
Availability of detailed technical data and an active watchmaker community simplifies parts sourcing and expert repairs.
Maintaining the A. Schild AS 1977 calibre with high-quality, original spare parts keeps these vintage timepieces running reliably while respecting their place in Swiss horological heritage.
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Stem, Crown, Hands & Spares might be available for this movement.
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