A. Schild (AS) Calibre 1950 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1950 is a vintage Swiss manual-wind mechanical movement, highly regarded for its precision, reliability, and classic design. Manufactured primarily around the 1960s, it features a sweep second hand and often includes a date complication, making it a popular choice among collectors and watchmakers restoring classic wristwatches.
Key Technical Highlights
Calibre: AS 1950 (also referenced as AS/ST 1950/51)
Movement Type: Manual winding, mechanical with sweep seconds and optional date
Diameter: 25.60 – 25.90 mm (11.5 lignes)
Height: Approximately 4.50 – 5.95 mm (variation depending on model/version)
Jewels: Typically 17 synthetic ruby jewels
Beat Rate: 21,600 vibrations per hour (3 Hz)
Power Reserve: Around 46 hours
Functions: Hours, minutes, sweep seconds, date (date set typically by changing time around 21:00 to 24:00)
Shock Protection: Vintage anti-shock system, commonly Incabloc
Signature Marks: Often signed AS, ST, or AS/ST on the movement
Common Spare Parts and Components
Mainspring and Barrel: Essential for stable and consistent power delivery; original or NOS (new-old-stock) mainsprings recommended.
Balance Wheel and Balance Staff: Precision parts crucial for timing accuracy and shock resistance; must match exactly to preserve reliability.
Pallet Fork and Escape Wheel: Wear-prone escapement parts that require authentic or NOS replacements for smooth operation.
Gear Train Wheels: Includes minute, third, and fourth wheels; sourced from donor movements or NOS stocks.
Setting Mechanism: Stem, crown, levers, springs including winding stems such as Part No. 401, essential for smooth winding, time setting, and calendar adjustments.
Jewels: Synthetic ruby bearings carefully arranged to reduce friction; exact replacements maintain movement integrity.
Hands and Dial Components: Period-correct parts maintain vintage aesthetic and collector appeal.
Date Mechanism Components: Date disc, jumper springs, and related parts ensure reliable calendar function.
Sourcing and Maintenance Tips
Always source original, NOS, or donor parts specifically designated for AS 1950 to ensure full compatibility and maintain movement quality.
Delicate components such as balance assembly, escapement, and calendar parts require careful handling during servicing.
Use modern synthetic watch oils sparingly, adhering to vintage lubrication standards to promote longevity and optimal function.
Verify the calibre number stamped on the main plate before ordering to avoid incompatibility issues.
Donor AS 1950 movements are valuable sources for rare or worn parts.
Why AS 1950 Spare Parts Matter
Authentic parts preserve the calibre’s accuracy, mechanical reliability, and smooth manual winding, vital for dependable vintage watch operation.
Proper restoration with genuine components safeguards the historical significance and collector value of this classic Swiss manual-wind movement.
Detailed technical documentation and an active watchmaker community facilitate expert repairs and efficient parts sourcing.
Maintaining the A. Schild AS 1950 calibre with high-quality, authentic spare parts is essential to keep these vintage manual-wind timepieces running reliably 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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