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A. Schild (AS) Calibre 1287 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1287 is a well-crafted vintage Swiss manual wind movement, introduced in the late 1940s. Known for its reliable construction, it features a directly driven sweep seconds hand, making it a popular choice among collectors and repair watchmakers specializing in mid-20th-century wristwatches.
Key Technical Highlights
Calibre: AS 1287
Movement Type: Manual wind, mechanical
Size: 10 1/2 lignes (approx. 23.2–23.7 mm diameter)
Height: Around 4.5 mm
Jewels: 17 synthetic ruby jewels, including cap jewels on escapement and gear train for reduced friction
Beat Rate: 18,000 vibrations per hour (vph)
Escapement: Pallet lever
Balance: Nickel screw balance with Unishock shock protection, hairspring moves counterclockwise
Winding: Yoke winding system
Power Reserve: Approximately 40 hours
Regulation: Long regulator arm with adjustable stud holder
Construction: Solid construction with separate center minute wheel bridge, considered state-of-the-art in its era
Common Spare Parts and Service Components
Mainspring and Barrel: Regular replacement needed due to fatigue; accurate sizing critical for proper power delivery.
Balance Staff and Balance Assembly: Delicate parts prone to wear or shock damage; original or compatible replacements recommended.
Pallet Fork and Escape Wheel: High wear components requiring correct fit for smooth escapement operation.
Wheels (Minute, Third, Fourth): Susceptible to tooth wear; sourcing from donor movements or NOS parts common.
Stem, Crown, and Winding Mechanism Components: Essential parts subject to wear; exact replacements necessary for reliable winding and time setting.
Jewels and Cap Jewels: Maintain low friction and durability; matching the original jewel setup is important.
Hands and Dial Components: Period-correct or restored hands and dials keep watch authenticity intact.
Sourcing Tips
Prefer original AS 1287-labeled spare parts or reliable donor movements for compatibility.
Sourcing from specialized vintage watch suppliers or watchmaker networks enhances chances of finding rare components.
Careful handling during servicing is necessary due to the movement’s delicate balance and escapement assembly.
Use modern synthetic oils sparingly, observing vintage lubrication standards.
Why AS 1287 Spare Parts Matter
Maintaining original or authentic spare parts ensures the reliable function, accuracy, and historical integrity of the watch.
The movement’s robust design and shock protection underscore its lasting appeal to collectors and vintage watch enthusiasts.
Proper parts sourcing facilitates effective restoration, preserving both the technical and aesthetic aspects of these mid-century Swiss watches.
AS Calibre 1287 stands as an exemplary Swiss manual-wind movement. Obtaining the correct spare parts is essential for sustaining its performance and preserving vintage watch heritage.