A. Schild (AS) Calibre 1900 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1900 is a vintage Swiss manual-wind mechanical movement appreciated for its reliability, robust construction, and classic design. Produced primarily around the 1970s, it features a sweep second hand, 17 to 21 jewel variants, and operates at a frequency of 21,600 vibrations per hour (3 Hz), offering a power reserve of about 48 hours. With a diameter of 25.60 mm (11.5 lignes) and a height of approximately 4.00 mm, it is a popular calibre among collectors and watchmakers restoring vintage wristwatches.
Key Technical Highlights
Calibre: AS 1900
Movement Type: Manual winding, mechanical with sweep second
Diameter: 25.60 mm (11.5 lignes)
Height: 4.00 mm
Jewels: 17 or 21 synthetic ruby jewels
Beat Rate: 21,600 vibrations per hour (vph)
Power Reserve: Approximately 48 hours
Lift Angle: 52°
Functions: Hours, minutes, sweep seconds
Shock Protection: Vintage anti-shock system
Common Spare Parts and Components
Mainspring and Barrel: Original or new-old-stock (NOS) mainsprings and barrels are critical for stable and steady power delivery.
Balance Wheel and Balance Staff: Precision components vital for accurate timekeeping and shock resistance; exact fits are essential.
Pallet Fork and Escape Wheel: Wear-prone escapement parts; sourcing genuine or NOS replacements helps maintain movement smoothness.
Gear Train Wheels (Minute, Third, Fourth): Frequently replaced due to wear or damage; typically harvested from donor movements or NOS stock.
Setting Mechanism (Stem, Crown, Levers, Springs): Precise fitting components ensure smooth winding and time-setting functions. Part No. 401 winding stem is often compatible.
Jewels: Synthetic ruby bearings arranged to minimize friction; replacements must match original layout for movement integrity.
Hands and Dial Components: Period-appropriate parts preserve the vintage aesthetic and collector appeal.
Other Notable Parts: Barrel bridge, balance cock, pallet cock, regulator for adjustable stud holder, cannon pinion varieties, yoke, ratchet wheel, and click spring.
Sourcing and Maintenance Tips
Use original, NOS, or donor parts specifically identified for the AS 1900 calibre to ensure compatibility and maintain movement quality.
Handle delicate components like the balance assembly and escapement parts carefully during service.
Apply modern synthetic watch oils sparingly, following vintage lubrication standards for optimal longevity and performance.
Always verify the calibre number stamped on the main plate before ordering parts to avoid mismatches.
Donor AS 1900 movements can be invaluable sources for rare or worn components.
Why AS 1900 Spare Parts Matter
Authentic parts preserve the calibre’s accuracy, mechanical reliability, and smooth manual winding operation, crucial for dependable vintage watch performance.
Proper restoration with genuine components safeguards the historical significance and collector value of this classic Swiss hand-wound movement.
Access to detailed technical documentation and an active watchmaker community supports expert repairs and efficient parts sourcing.
Maintaining the A. Schild AS 1900 calibre with high-quality, authentic spare parts is essential for ensuring these vintage manual-wind watches continue to run reliably while honoring their place in Swiss horological history.
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Stem, Crown, Hands & Spares might be available for this movement.
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