A. Schild (AS) Calibre 1875 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1875 is a vintage Swiss mechanical movement, typically found in manual-wind and automatic wristwatches. It is known for reliable performance, practical complications like day and date functions (often with quickset date), and a robust construction that makes it a favorite among collectors and watchmakers restoring mid-20th-century watches.
Key Technical Highlights
Calibre: AS 1875
Movement Type: Manual winding or automatic, mechanical (depending on variant)
Diameter: Approximately 25.60 mm (11.5 lignes)
Height: Around 4.70 mm
Jewels: 17, 21, 25, or 26 synthetic ruby jewels (varies by exact model)
Beat Rate: 21,600 vibrations per hour (vph)
Power Reserve: Approximately 42 hours
Functions: Hours, minutes, sweep seconds, day and date complications (date quickset by repeated pushing the crown)
Shock Protection: Vintage anti-shock system, often Incabloc type
Rotor: Ball-bearing type rotor for smooth automatic winding (on automatic versions)
Common Spare Parts and Components
Mainspring and Barrel: Essential for consistent power delivery; original or new-old-stock (NOS) mainsprings are recommended for maintaining torque and durability.
Balance Wheel and Balance Staff: Precision parts crucial for accurate timekeeping and shock resistance; must match exactly for reliable performance.
Rotor Assembly and Bearings: Vital for automatic winding; worn or damaged parts require replacement with genuine or NOS components.
Pallet Fork and Escape Wheel: Escapement parts prone to wear; sourcing original or NOS pieces ensures smooth operation.
Gear Train Wheels (Minute, Third, Fourth): Commonly replaced due to wear; sourced from donor movements or NOS stock.
Setting Mechanism (Stem, Crown, Levers, Springs): Must fit precisely for smooth winding, time, day, and date adjustments; winding stems like the original Swiss-made Part No. 401 are often compatible.
Jewels: Synthetic ruby bearings arranged to minimize friction; replacements must exactly match the original layout.
Hands and Dial Components: Period-correct parts maintain vintage authenticity and enhance collector value.
Sourcing and Maintenance Tips
Use only original, NOS, or donor parts specifically identified for AS 1875 to guarantee compatibility and maintain movement quality.
Exercise caution during servicing with delicate components such as the balance assembly and escapement.
Apply modern synthetic watch lubricants sparingly, following vintage protocols for long-lasting performance.
Always verify the calibre number stamped on the movement main plate before ordering parts.
Donor AS 1875 movements are valuable sources for rare or worn components.
Why AS 1875 Spare Parts Matter
Genuine spare parts preserve the calibre’s accuracy, reliability, and efficient automatic/manual winding functions, key for dependable watch operation.
Proper restoration using authentic components maintains the historical importance and collector appeal of these vintage Swiss watches.
Extensive technical documentation and a dedicated watchmaker network facilitate effective parts sourcing and expert servicing.
Maintaining the A. Schild AS 1875 calibre with high-quality spare parts is essential for ensuring these classic vintage movements continue to perform smoothly while honoring their place in Swiss horological heritage.
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Stem, Crown, Hands & Spares might be available for this movement.
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