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A. Schild (AS) Calibre 1200 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1200 is a vintage Swiss manual-wind mechanical movement produced primarily in the 1950s. It is known for its reliability, compact size, and classic design, often found in mid-century wristwatches. Proper sourcing of compatible and authentic spare parts is essential for maintaining the performance and originality of these movements.
Key Technical Highlights
Calibre: AS 1200
Movement Type: Manual wind, mechanical
Diameter: 10.5 lignes (approx. 23.3 mm)
Height: 3.5 mm
Jewels: Typically 15 (some variants with 17)
Beat Rate: 18,000 vibrations per hour (A/h)
Power Reserve: Approximately 45 hours
Lift Angle: 52 degrees
Functions: Hours, minutes, small seconds
Production Era: Circa 1950s
Known Variants: Similar calibres include AS 1247, AS 1288, and AS 1317
Common Spare Parts and Service Components
Mainspring and Barrel: Key for power transmission; aged mainsprings often fatigue and need precise replacement to ensure consistent power delivery.
Balance Wheel and Balance Staff: Critical for accurate timekeeping; prone to shock damage and wear, requiring exact matching parts or donor assemblies.
Hairspring: Flat type, essential for regulating beat; often delicate and may require replacement or adjustment.
Pallet Fork and Escape Wheel: Subject to wear from oscillation and should be matched accurately to the AS 1200 for smooth escapement operation.
Wheels (Minute, Third, Fourth): Tooth wear or pivot damage is common; sourcing from donor movements or NOS (new old stock) parts helps maintain precision.
Stem, Crown, and Setting Mechanism: Vital components for manual winding and time setting, which may wear out with age and require exact fittings.
Jewels: Replacement ruby bearings must match jewel count and position to maintain low friction and durability.
Hands and Dials: Period-correct components help preserve authenticity but are often rare and sourced from collectors or specialized suppliers.
Sourcing and Maintenance Tips
Original or NOS Parts: Prioritize parts specifically marked for AS 1200 to ensure compatibility and maintain authenticity.
Donor Movements: Salvaging parts from non-functioning AS 1200 movements is a practical way to source rare components.
Careful Handling: The movement has limited shock protection; handle balance and escapement components with care during servicing.
Lubrication: Use modern synthetic oils sparingly and according to vintage watch standards to avoid excessive wear.
Identification: The AS 1200 calibre number is usually stamped on the movement’s main plate and is essential for correct part identification.
Why AS 1200 Spare Parts Matter
Robust and Reliable Design: Maintaining original parts preserves the movement’s hallmark reliability and precision.
Vintage Authenticity: Correct spare parts help retain historical and collector value of mid-20th-century wristwatches.
Watchmaker Familiarity: AS 1200 enjoys recognition among vintage watchmakers, facilitating repair and maintenance with accessible knowledge and parts networks.
A. Schild AS 1200 is a classic manual-wind caliber that remains a favorite among vintage watch enthusiasts. Access to quality spare parts is essential to keep these mechanical timepieces running authentically and reliably.