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A. Schild (AS) Calibre 1220 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1220 is a vintage Swiss manual-wind mechanical movement introduced in the late 1940s. It is recognized for its reliable construction, unique main bridge design, and the modern feature of a directly driven sweep seconds hand. The movement remains popular among collectors and watchmakers restoring vintage wristwatches.
Key Technical Highlights
Calibre: AS 1220
Movement Type: Manual wind, mechanical
Diameter: Approximately 10 1/2 lignes (22.8 to 23.3 mm)
Height: About 4.02 mm
Jewels: 17 synthetic ruby jewels
Beat Rate: 18,000 vibrations per hour (A/h)
Power Reserve: Around 34 hours
Escapement: Pallet lever type
Balance: Nickel screw balance with counterclockwise hairspring
Shock Protection: Two 3-leg shock protection systems, likely Ruby-Shock type
Winding Mechanism: Yoke winding system on the dial side
Special Features:
Uncommon transmission gear setup after escapement and wheels, possibly due to space constraints
Offset center wheel and modern direct-driven center seconds
Long regulator arm for fine adjustment
Common Spare Parts for AS 1220
Mainspring and Barrel: Essential for power delivery; aged mainsprings often require accurate replacements.
Balance Staff and Balance Assembly: Fragile parts prone to shock damage; matching parts needed for reliable timekeeping.
Pallet Fork and Escape Wheel: Critical escapement parts that wear over time and need original or compatible replacements.
Transmission Wheels (Minute, Third, Fourth): Can suffer wear or damage; donor movements or NOS parts are typical sources.
Stem, Crown, Setting Lever and Springs: Components essential for winding and time setting, often replaced due to wear.
Jewels and Bearings: Maintain low friction and smooth operation; replacement jewels must match original type and placement.
Hands and Dial Components: Period-correct parts help preserve authenticity and proper fit during restoration.
Sourcing and Maintenance Tips
Use original parts marked for AS 1220 or reliable donor movements for best compatibility.
Handle the movement carefully due to shock-sensitive balance and escapement parts.
Employ modern synthetic oils sparingly to maintain lubrication while respecting vintage standards.
Verify dimensions carefully, especially for mainspring and wheels, given some unique transmission design aspects.
The calibre number is stamped on the main plate or under the balance cock for positive identification when ordering parts.
Why AS 1220 Spare Parts Matter
The AS 1220 represents a technically advanced and robust mid-20th-century Swiss manual caliber.
Maintaining authenticity with correct spare parts preserves timekeeping precision, reliability, and collector value.
Its unique construction and direct-drive sweep seconds make it a notable movement within vintage horology circles.
A. Schild AS 1220 remains a valued manual-wind movement, and quality spare parts sourcing is essential for sustaining its legacy in vintage watch repair and restoration.