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A. Schild (AS) Calibre 1591 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1591 is a vintage Swiss automatic mechanical movement known for its reliable automatic winding, small seconds subdial, and date function. It features a classic 13-ligne size and a diameter around 29.00 mm, making it a popular calibre for mid-20th-century wristwatches restored by collectors and watchmakers.
Key Technical Highlights
Calibre: AS 1591
Movement Type: Automatic, self-winding mechanical
Diameter: Approximately 29.00 mm (13 lignes)
Functions: Hours, minutes, small seconds, date window
Jewels: Typically 17 synthetic ruby jewels
Beat Rate: 18,000 vibrations per hour (vph)
Power Reserve: Around 36-40 hours (typical for similar AS calibres)
Common Spare Parts and Components
Mainspring and Barrel: Crucial for power storage and smooth energy delivery; replacement parts must match original dimensions for reliable operation.
Balance Wheel and Balance Staff: Vital for accurate timekeeping and shock resistance; delicate components requiring exact fit.
Rotor Assembly and Bearings: Essential for efficient automatic winding; worn rotor axles or bearings require precise replacement.
Pallet Fork and Escape Wheel: These escapement parts are wear-prone; sourcing original or new-old-stock (NOS) parts ensures smooth functionality.
Gear Train Wheels (Minute, Third, Fourth): Wheels may suffer wear and pivot damage; donor movements or NOS parts are typical sources.
Setting Mechanism (Stem, Crown, Levers, Springs): Must fit AS 1591 specifications exactly for reliable winding, time, and date setting.
Jewels: Synthetic ruby bearings must be correctly placed to reduce friction and wear; replacements must match original count and location.
Hands and Dial Components: Period-correct parts preserve vintage authenticity and collector value.
Sourcing and Maintenance Tips
Prioritize original or NOS spare parts marked explicitly for AS 1591 to guarantee compatibility and authenticity.
Donor AS 1591 movements provide valuable sources for rare or worn components, especially rotor assemblies and escapement parts.
Handle delicate components carefully during servicing, particularly the balance wheel and rotor assembly.
Use modern synthetic watch lubricants sparingly, adhering to vintage lubrication standards for longevity and performance.
Always verify the calibre number stamped on the main plate before ordering parts to avoid incompatibility.
Why AS 1591 Spare Parts Matter
Maintaining authentic or exact compatible parts preserves the calibre’s accuracy, automatic winding efficiency, and reliability.
Proper restoration sustains the historical significance and collector appeal of vintage Swiss automatic watches.
The AS 1591’s well-documented design facilitates spare parts sourcing and technical servicing support within the watchmaker community.
Keeping the A. Schild AS 1591 calibre properly serviced with quality spare parts ensures reliable ongoing operation and preserves its legacy as a classic Swiss automatic movement.