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A. Schild (AS) Calibre 1748 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1748 is a vintage Swiss automatic mechanical movement admired for its robust automatic winding system, date complication, and sweep seconds feature. It measures approximately 25.60 mm (11.5 lignes) in diameter with a height of about 4.60 mm. The calibre runs at a beat rate of 18,000 vibrations per hour (vph) and typically contains 21 or 25 synthetic ruby jewels. It is known for its reliable performance and was widely used in mid-20th-century gentlemen’s automatic watches.
Key Technical Highlights
Calibre: AS 1748
Movement Type: Automatic, mechanical with date and sweep seconds
Diameter: 25.60 mm (11.5 lignes)
Height: 4.60 mm
Jewels: 21 or 25 synthetic ruby jewels
Beat Rate: 18,000 vibrations per hour (vph)
Power Reserve: Approximately 42 hours
Functions: Hours, minutes, sweep seconds, date complication
Shock Protection: Vintage systems such as Incabloc
Notable: Ball-bearing rotor for smooth automatic winding
Common Spare Parts and Components
Mainspring and Barrel: Crucial for power storage and stable torque delivery; replacements must match original specifications to ensure longevity.
Balance Wheel and Balance Staff: Essential precision parts requiring exact fit and compatible shock protection for reliable timing.
Rotor Assembly and Bearings: Key to automatic winding efficiency; worn bearings and rotor parts should be replaced with quality compatibles or NOS (new-old-stock).
Pallet Fork and Escape Wheel: Wear-prone escapement components; sourcing original or high-quality NOS parts is necessary for smooth function.
Gear Train Wheels (Minute, Third, Fourth): Frequently replaced due to wear or damage; commonly obtained from donor movements or NOS stock.
Setting Mechanism (Stem, Crown, Levers, Springs): Must fit perfectly to allow smooth winding, time-setting, and date adjustment.
Jewels: Synthetic ruby bearings arranged to minimize friction; replacements must correspond to original layout and count.
Hands and Dial Components: Period-correct parts preserve vintage authenticity and collector value.
Sourcing and Maintenance Tips
Use original, NOS, or donor parts specified for AS 1748 to guarantee perfect fit and maintain movement integrity.
Handle delicate components such as balance wheel, rotor assembly, and escapement carefully during servicing to avoid damage.
Apply modern synthetic watch lubricants sparingly and follow vintage lubrication protocols for longevity and optimal performance.
Always verify the calibre number stamped on the main plate before ordering parts to prevent incompatibility.
Donor movements are valuable sources for rare or hard-to-find components such as date wheels, rotor parts, and escapement pieces.
Why AS 1748 Spare Parts Matter
Genuine parts preserve the calibre’s accuracy, automatic winding efficiency, and mechanical durability, essential for reliable daily use.
Proper restoration with authentic components helps maintain the historical significance and collector appeal of these mid-century automatic watches.
Detailed technical documentation and an active watchmaker community facilitate trusted parts sourcing and expert repair services.
Maintaining the A. Schild AS 1748 calibre with quality spare parts is key to keeping these refined vintage automatic movements running smoothly while preserving their esteemed place in Swiss horological history.