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A. Schild (AS) Calibre 1825 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1825 is a vintage Swiss automatic movement recognized for its robust durability, mid-century engineering, and recurring use in classic wristwatches of the 1960s–1970s. Accurate servicing and restoration rely on proper identification and sourcing of authentic spare parts.
Key Technical Highlights
Calibre: AS 1825
Movement Type: Automatic, mechanical
Diameter: 11.5 lignes (approx. 25.60mm)
Height: About 5.25mm
Jewels: 17, 21, or 25 synthetic ruby jewels
Beat Rate: 18,000 vibrations per hour (vph)
Lift Angle: 52°
Power Reserve: Approx. 42 hours
Functions: Hours, minutes, sweep seconds, quickset date (family includes manual and quickset variants)
Common Spare Parts and Components
Mainspring and Barrel: Provide reliable and stable power; new-old-stock (NOS) or original mainsprings are recommended for best performance.
Balance Wheel and Balance Staff: Precision-shock protected components crucial for timekeeping accuracy; must be matched exactly for proper function.
Rotor Assembly and Bearings: Essential for efficient automatic winding; use genuine or NOS parts for smooth rotation and reduced wear.
Pallet Fork and Escape Wheel: Escapement parts prone to wear – sourcing original/NOS pieces preserves long-term operation.
Gear Train Wheels (Minute, Third, Fourth): Subject to wear and often replaced; donor movements or NOS stock are typical sources.
Winding Stem (Part No. 401): Official winding stem for AS 1825, shared with AS 1820/1824/other contemporaries; original Swiss-made stems ensure seamless fit and movement operation.
Setting Mechanism (Crown, Levers, Springs): Must be original spec for reliable manual winding, time, and quickset date adjustments.
Barrel Arbor (Part No. 195): Ensures smooth mainspring operation; essential for power transmission and longevity.
Jewels: Synthetic ruby bearings must match original placement and count.
Hands and Dial Components: Period parts critical for authentic restoration and collector aesthetics.
Sourcing and Maintenance Tips
Use original, NOS, or marked donor parts specific to AS 1825 to ensure compatibility and movement quality.
Always confirm the calibre number stamped on the main plate before ordering parts to avoid mismatches.
Handle fragile parts like the balance, rotor, and escapement with care during servicing.
Apply modern synthetic lubricants sparingly, following vintage protocols for optimal lifespan.
Donor AS 1825 movements remain essential sources for rare or worn components.
Why AS 1825 Spare Parts Matter
Genuine parts protect the calibre’s accuracy, automatic winding efficiency, and mechanical reliability.
Proper restoration preserves the historical and collector value of classic Swiss automatic watches.
Access to technical documentation and an active vintage watchmaker community facilitates reliable parts sourcing and expert repairs.
Maintaining the A. Schild AS 1825 movement with quality, authentic spare parts is essential for preserving its performance and status in Swiss horological history.