A. Schild (AS) Calibre 1977.2 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1977.2 is a vintage Swiss manual-winding mechanical movement known for its compact size, reliability, and classic manual winding mechanism. It is an improved version of the AS 1977 calibre with key modifications to the balance and barrel, making it a sought-after calibre for vintage watch restoration, especially for smaller watches.
Key Technical Highlights
Calibre: AS 1977.2
Movement Type: Manual winding, mechanical
Dimensions: Approximately 13.05 x 15.20 mm (5.75 x 6.75 lignes)
Height: ~3.50 mm
Jewels: 17 or 21 synthetic ruby jewels
Beat Rate: 21,600 vibrations per hour (3 Hz)
Power Reserve: Around 44 hours
Functions: Hours, minutes, sweep seconds
Shock Protection: Vintage anti-shock system (commonly Incabloc or equivalent)
Notable Updates: New balance and barrel compared to earlier AS 1977 variants
Winding Gear: Redesigned for improved durability in this and related variants
Common Spare Parts and Components
Mainspring and Barrel: Key parts for consistent power delivery; original or NOS mainsprings and barrel assemblies ensure reliable torque and longevity.
Balance Wheel and Balance Staff: Precision components essential for accurate timekeeping and shock resistance; must be exact match for reliable operation.
Pallet Fork and Escape Wheel: Escapement parts subject to wear; replacement with genuine or NOS parts maintains smooth movement.
Gear Train Wheels: Includes minute, third, and fourth wheels; replacements often sourced from donor movements or NOS stock.
Setting Mechanism (Stem, Crown, Levers, Springs): Accurate fitting parts critical for smooth manual winding and time setting. Winding stems like Part No. 401 are typically compatible.
Jewels: Synthetic ruby bearings reduce friction; replacements must match original jewel layout to maintain movement integrity.
Hands and Dial Components: Period-appropriate parts preserve the vintage look and authenticity.
Sourcing and Maintenance Tips
Always use original, NOS, or donor parts specifically designated for AS 1977.2 to ensure proper fit and maintain quality.
Handle delicate components such as the balance assembly, escapement, and barrel carefully during servicing.
Apply modern synthetic watch oils sparingly, adhering to vintage lubrication protocols for longevity and performance.
Verify the calibre number stamped on the main plate before ordering parts to avoid mismatches.
Donor AS 1977.2 and similar 1977-series movements can be valuable sources for rare or worn components.
Why AS 1977.2 Spare Parts Matter
Genuine parts preserve the calibre’s accuracy, mechanical reliability, and smooth manual winding — essential for dependable vintage watch operation.
Proper restoration with authentic parts maintains the historical significance and collector value of this classic Swiss manual-wind movement.
Availability of detailed technical information and an active watchmaker community supports expert repairs and efficient parts sourcing.
Maintaining the A. Schild AS 1977.2 calibre with high-quality, authentic spare parts is crucial for keeping these vintage manual-wind watches running reliably while honoring their place in Swiss horological heritage.
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Stem, Crown, Hands & Spares might be available for this movement.
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