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A. Schild (AS) Calibre 1747 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1747 is a vintage Swiss manual-wind mechanical movement notable for its slim profile, reliability, and the inclusion of both sweep seconds and date complication. The calibre features a diameter of approximately 25.60 mm (11.5 lignes) and a height of about 3.60 mm. It runs at a standard beat rate of 18,000 vibrations per hour (vph) and typically contains 17 or 21 synthetic ruby jewels. The AS 1747 is valued by collectors and watchmakers for mid-20th-century watch restorations.
Key Technical Highlights
Calibre: AS 1747
Movement Type: Manual winding, mechanical
Diameter: 25.60 mm (11.5 lignes)
Height: 3.60 mm
Jewels: 17 or 21 synthetic ruby jewels
Beat Rate: 18,000 vibrations per hour (vph)
Power Reserve: Approximately 48 hours
Functions: Hours, minutes, sweep seconds, date complication
Shock Protection: Standard vintage anti-shock system
Date Setting: Time adjustment between evening hours (typically 20:00 to 24:00)
Common Spare Parts and Components
Mainspring and Barrel: Critical for consistent power delivery; NOS and original replacements ensure proper torque and durability.
Balance Wheel and Balance Staff: Precision components vital for accuracy and shock resistance; require correct sizing and proper shock protection.
Pallet Fork and Escape Wheel: Escapement parts that experience wear; sourcing original or high-quality NOS parts ensures smooth operation.
Gear Train Wheels (Minute, Third, Fourth): Frequently replaced due to wear; typically sourced from donor movements or NOS stock.
Setting Mechanism (Stem, Crown, Levers, Springs): Must fit precisely for reliable winding, time, and date setting functions.
Jewels: Synthetic ruby bearings to reduce friction; replacements must conform to the original jewel layout.
Hands and Dial Components: Period-correct parts help maintain vintage authenticity and collector value.
Sourcing and Maintenance Tips
Use original, NOS, or donor parts explicitly marked for AS 1747 to maintain movement integrity.
Handle delicate components such as balance and escapement carefully during servicing.
Apply modern synthetic watch oils sparingly, adhering to vintage lubrication standards for longevity.
Verify the calibre number stamped on the main plate before ordering parts to avoid incompatibility.
Donor movements and specialty suppliers provide valuable sources for rare or worn components such as mainsprings and winding stems.
Why AS 1747 Spare Parts Matter
Genuine parts preserve the calibre’s accuracy, reliability, and classic vintage character.
Proper restoration using authentic components helps maintain the historical significance and collector appeal of these classic manual-wind movements.
The well-documented design and active vintage watchmaker community support efficient parts sourcing and expert servicing.
Maintaining the A. Schild AS 1747 calibre with high-quality spare parts is essential to keep these refined vintage watches running reliably, preserving their important place in Swiss horology heritage.