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A. Schild (AS) Calibre 1533 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1533 is a vintage Swiss automatic mechanical movement, prized for its compact size, robust automatic winding system, and reliability. Produced in the mid-20th century, it remains a favored choice among collectors and watchmakers restoring classic automatic timepieces.
Key Technical Highlights
Calibre: AS 1533
Movement Type: Automatic, self-winding mechanical
Dimensions: Approximately 15.30 x 16.70 mm
Height: 5.30 mm
Jewels: Typically 17, 21, or 25 synthetic ruby jewels depending on version
Beat Rate: 18,000 vibrations per hour (vph)
Power Reserve: Around 35 hours
Functions: Hours, minutes, sweeping seconds, automatic winding
Shock Protection: Vintage style, commonly Incabloc or similar
Common Spare Parts and Components
Mainspring and Barrel: Crucial for energy storage and stable power delivery; must exactly match original specifications for reliable operation.
Balance Wheel and Balance Staff: Essential for accuracy and shock resistance; precise fit and quality replacements are necessary.
Rotor Assembly and Bearings: Vital for efficient automatic winding; bearing or axle wear requires careful servicing or replacement with compatible parts.
Pallet Fork and Escape Wheel: Key escapement components subject to wear; sourcing original or new-old-stock (NOS) parts is important to ensure smooth function.
Gear Train Wheels (Minute, Third, Fourth): Commonly replaced due to wear; often sourced from donor movements or NOS stock.
Setting Components (Stem, Crown, Levers, Springs): Must fit exactly for reliable winding, time-setting, and automatic winding functionalities.
Jewels: Synthetic ruby bearings reduce friction and wear; replacements must correspond to original count and positioning.
Hands and Dial Components: Period-correct parts help preserve vintage authenticity during restoration.
Sourcing and Maintenance Tips
Prioritize original or NOS parts explicitly marked for AS 1533 to maintain authenticity and compatibility.
Donor movements are invaluable sources for rare or worn components such as rotor assemblies and escapement parts.
Handle delicate parts, especially the balance wheel and rotor assembly, with care during servicing.
Use modern synthetic watch oils 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 1533 Spare Parts Matter
Authentic spare parts preserve the movement’s accuracy, automatic winding reliability, and vintage value.
Proper parts sourcing supports the sustained functional restoration and collector appeal of these classic mid-century Swiss automatic watches.
The AS 1533’s documented technical specifications ease sourcing replacement components and expert servicing.
Maintaining the A. Schild AS 1533 calibre with quality spare parts is essential for keeping these compact, efficient vintage automatic movements running reliably and preserving their esteemed heritage.