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A. Schild (AS) Calibre 1717 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1717 is a vintage Swiss automatic mechanical movement introduced around 1963-1964. Known for its exceptionally flat design with a height of approximately 4.10 mm, it was ideal for ultra-thin wristwatches of the era. This calibre features reliable automatic winding with a ball-bearing rotor and includes a sweep seconds hand and date complication. It operates at 18,000 vibrations per hour (vph), offers a power reserve of about 42 hours, and typically contains 17, 21, or 25 synthetic ruby jewels depending on the version.
Key Technical Highlights
Calibre: AS 1717
Movement Type: Automatic, self-winding mechanical
Diameter: 25.60 mm (11.5 lignes)
Height: Approximately 4.10 mm
Jewels: 17, 21, or 25 synthetic ruby jewels
Beat Rate: 18,000 vibrations per hour (vph)
Power Reserve: Around 42 hours
Shock Protection: Incabloc anti-shock system
Balance: Large Glucydur balance with blue Nivarox hairspring and movable stud
Date Function: Instant date change, set by changing time between 20:00 and 24:00
Rotor: Ball-bearing mounted for smooth and efficient winding
Common Spare Parts and Components
Mainspring and Barrel: Precise replacements ensure consistent torque and power delivery.
Balance Wheel and Balance Staff: Critical precision parts requiring exact fitment and compatible shock protection for optimal accuracy.
Rotor Assembly and Bearings: Ball bearing rotor parts wear over time and need correct compatible replacements.
Pallet Fork and Escape Wheel: Wear-prone escapement components; sourcing original or new-old-stock (NOS) parts improves reliability.
Gear Train Wheels (Minute, Third, Fourth): Common wear items, often salvaged from donor movements or available as NOS.
Setting Mechanism (Stem, Crown, Levers, Springs): Must fit precisely to enable reliable winding, time setting, and date adjustment.
Jewels: Synthetic ruby bearings reducing friction; must match original configuration to preserve movement longevity.
Hands and Dial Components: Period-correct parts maintain vintage authenticity and collector appeal.
Sourcing and Maintenance Tips
Use original, NOS, or donor parts specifically marked for AS 1717 to ensure compatibility and preserve movement integrity.
Handle delicate components like the balance wheel, rotor assembly, and escapement with care during servicing.
Apply modern synthetic watch oils sparingly, adhering to vintage lubrication protocols to maximize longevity.
Always verify the calibre number stamped on the main plate before ordering parts to avoid ordering incorrect components.
Donor movements offer valuable sources for hard-to-find or worn components, including date and rotor parts.
Why AS 1717 Spare Parts Matter
Authentic or precisely compatible parts maintain the calibre’s accuracy, automatic winding efficiency, and mechanical durability.
Proper restoration preserves the historical significance and collector value of these classic Swiss automatic watches.
The well-documented design and active vintage watchmaker community simplify parts sourcing and expert servicing.
Maintaining the A. Schild AS 1717 calibre with quality spare parts is essential for keeping these slim, reliable vintage automatic movements operating smoothly and preserving their esteemed place in horological history.