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A. Schild (AS) Calibre 1187 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1187 is a classic Swiss manual-wind mechanical movement from the mid-20th century, renowned for its robust construction and reliable sweep seconds function. It is a popular choice among vintage watch collectors and repairers. Proper sourcing of authentic spare parts is essential to maintain its originality and performance.
Key Technical Highlights
Calibre: AS 1187
Size: 10 1/2 lignes (approx. 23.3 mm diameter)
Beat Rate: 18,000 vibrations per hour (A/h)
Jewels: Typically available in 7 or 15 jewel versions
Shock Protection: Equipped with Incabloc shock protection on balance wheel
Balance: Nickel screw balance with a long regulator arm and counterclockwise hairspring
Winding: Manual wind with a yoke winding system on the dial side
Special Feature: Directly driven center seconds hand, requiring a two-layer construction that increases movement height
Common Spare Parts and Maintenance Components
Mainspring and Barrel: Critical for power delivery; fatigue or breakage over time makes replacement necessary. Common mainspring dimensions are approximately 1.60 mm wide, 290-300 mm length.
Balance Staff and Balance Assembly: Delicate parts that influence timekeeping accuracy; replacement usually requires exact parts matched to shock or non-shock variants.
Pallet Fork and Escape Wheel: High-wear components requiring original or compatible replacements to ensure smooth escapement operation.
Minute, Third, and Fourth Wheels: Prone to wear or damage; frequently sourced from donor AS 1187 movements or NOS (new-old-stock).
Stem, Crown, and Setting Mechanism: Essential for reliable winding and time setting; replacement parts need to fit exactly to the AS 1187.
Jewels: Ruby bearings reduce friction; replacement jewels must match original jewel count and placement.
Hands and Dial: Period-correct hands and dials are often sought for authentic restoration since they are rare and typically sourced from collectors or specialists.
Sourcing and Service Tips
Original Parts: Prefer parts specifically marked for AS 1187 to maintain compatibility and authenticity.
Donor Movements: Non-functional AS 1187 movements are invaluable for harvesting rare parts like wheels and escapements.
Handling: The movement has limited shock protection so careful handling during servicing is crucial.
Lubrication: Use modern synthetic oils sparingly and according to vintage watch standards.
Identification: The calibre number is often stamped under the balance or on the main plate and essential for correct part ordering.
Why AS 1187 Spare Parts Matter
Robust and Reliable: Maintaining with original or authentic parts preserves the renowned reliability and precision of the AS 1187 movement.
Collector Value: Accurate restoration with genuine parts retains the movement’s historical and collector appeal.
Watchmaker Familiarity: AS 1187 remains well-known to vintage watchmakers, facilitating repairs with the right parts and expertise.
A. Schild AS 1187 is a hallmark of mid-20th-century Swiss watch engineering, and sourcing correct spare parts is key to sustaining its function and authenticity for generations.