A. Schild (AS) Calibre 1951 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1951 is a vintage Swiss manual-winding mechanical movement valued for its reliability, precise timekeeping, and practical date complication. Produced primarily around the mid-20th century, this calibre features a sweep second function, manual winding, and a date display that is typically set by changing the time between 21:00 and midnight. It is highly regarded among collectors and watchmakers restoring classic wristwatches.
Key Technical Highlights
Calibre: AS 1951
Movement Type: Manual winding, mechanical with sweep seconds and date
Diameter: 25.60 mm (11.5 lignes)
Height: Approximately 4.50 mm
Jewels: 17 synthetic ruby jewels
Beat Rate: 21,600 vibrations per hour (3 Hz)
Power Reserve: Around 46 hours
Functions: Hours, minutes, sweep seconds, date
Shock Protection: Vintage anti-shock system, typically Incabloc or equivalent
Signature Marks: AS, ST, or AS/ST
Common Spare Parts and Components
Mainspring and Barrel: Essential for reliable power delivery; original or New-Old-Stock (NOS) mainsprings ensure proper torque and longevity.
Balance Wheel and Balance Staff: Precision parts critical for accurate timekeeping and shock resistance; must be exact fit.
Pallet Fork and Escape Wheel: Wear-prone escapement components; sourcing original or NOS replacements ensures smooth operation.
Gear Train Wheels (Minute, Third, Fourth): Often replaced due to wear or damage; typically harvested from donor movements or NOS stock.
Setting Mechanism (Stem, Crown, Levers, Springs): Precise fitting parts vital for smooth winding, time setting, and quick date adjustment. Compatible winding stems such as Part No. 401 are commonly used.
Jewels: Synthetic ruby bearings positioned to minimize friction; replacements must match the original layout exactly.
Hands and Dial Components: Period-appropriate parts preserve the vintage aesthetic and maintain collector value.
Sourcing and Maintenance Tips
Use original, NOS, or donor parts specifically designated for AS 1951 to guarantee full compatibility and maintain movement integrity.
Handle delicate components like the balance assembly, escapement, and setting mechanism with care during servicing.
Apply modern synthetic watch oils sparingly and in accordance with vintage lubrication protocols to enhance longevity and performance.
Verify the calibre number stamped on the movement main plate before ordering parts to avoid mismatches.
Donor AS 1951 movements serve as valuable sources for rare or difficult-to-find components.
Why AS 1951 Spare Parts Matter
Genuine parts preserve the calibre’s accuracy, manual winding reliability, and smooth date functionality, essential for dependable vintage watch operation.
Authentic restoration maintains the historical significance and collector value of this classic Swiss manual-wind movement.
Well-documented technical specifications and an active watchmaker community support efficient parts sourcing and expert servicing.
Maintaining the A. Schild AS 1951 calibre with high-quality, authentic spare parts ensures these vintage mechanical watches continue to run reliably while honoring their respected place in Swiss horology heritage.
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Stem, Crown, Hands & Spares might be available for this movement.
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