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A. Schild (AS) Calibre 1681 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1681 is a vintage Swiss automatic mechanical movement, highly regarded for its reliable automatic winding system, sweep seconds, and date function. Measuring approximately 25.60 mm in diameter (11.5 lignes) and about 5.20 mm in height, it operates at a beat rate of 18,000 vibrations per hour (vph) and features 17, 21, or 25 synthetic ruby jewels depending on the version. This calibre is prized by collectors and watchmakers specializing in mid-20th-century automatic wristwatch restoration.
Key Technical Highlights
Calibre: AS 1681
Movement Type: Automatic, self-winding mechanical
Diameter: 25.60 mm (11.5 lignes)
Height: Approximately 5.20 mm
Jewels: Typically 17, 21, or 25 synthetic ruby jewels
Beat Rate: 18,000 vibrations per hour (vph)
Power Reserve: Around 40 hours (typical for similar AS calibres)
Functions: Hours, minutes, sweep seconds, date (set by changing time between 20:30-24:00)
Shock Protection: Standard vintage anti-shock system (commonly Incabloc or equivalent)
Production Era: Circa late 1950s to early 1960s
Common Spare Parts and Components
Mainspring and Barrel: Essential for stable power storage and delivery; replacements must exactly match original dimensions and strength for reliable torque.
Balance Wheel and Balance Staff: Critical precision parts requiring exact fitment and shock resistance compatibility for accurate timing.
Rotor Assembly and Bearings: Integral to automatic winding efficiency; worn rotor axles or bearings need precise replacement to maintain smooth function.
Pallet Fork and Escape Wheel: Wear-prone escapement components; sourcing original or quality new-old-stock (NOS) parts ensures reliable escapement operation.
Gear Train Wheels (Minute, Third, Fourth): Common replacement parts due to wear or pivot damage; typically sourced from donor movements or NOS stock.
Setting Mechanism (Stem, Crown, Levers, Springs): Must fit precisely to enable smooth winding, time, and date setting functions.
Jewels: Synthetic ruby bearings designed to reduce friction and wear; replacements must correspond to original count and layout.
Hands and Dial Components: Period-appropriate parts help maintain vintage authenticity and collector appeal.
Sourcing and Maintenance Tips
Use original, NOS, or donor parts explicitly marked for AS 1681 to ensure perfect compatibility and maintain movement integrity.
Donor AS 1681 movements can be invaluable resources for hard-to-find or worn components, notably rotor and escapement parts.
Handle delicate components with care during servicing, particularly the balance wheel and rotor assembly.
Apply modern synthetic watch oils sparingly, adhering to vintage lubrication standards for longevity and optimal performance.
Always verify the calibre number stamped on the main plate before ordering spare parts to avoid ordering incompatible components.
Why AS 1681 Spare Parts Matter
Using authentic or exact compatible parts preserves the calibre’s accuracy, automatic winding efficiency, and reliability.
Proper restoration with genuine components maintains the historical integrity and collector value of classic Swiss automatic timepieces.
The documented technical profile and active watchmaker community support make sourcing and servicing easier for the AS 1681 calibre.
Maintaining the A. Schild AS 1681 calibre with quality spare parts is essential for keeping these vintage automatic movements running reliably and preserving their respected place in Swiss horology.