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A. Schild (AS) Calibre 1749 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1749 is a vintage Swiss automatic mechanical movement known for its reliable automatic winding system, sweep seconds hand, and date complication. It is an extension of the AS 1748 calibre, featuring a date mechanism and a single-direction (counterclockwise) winding module. This calibre measures approximately 25.60 mm (11.5 lignes) in diameter with a height of about 4.60 mm. It operates at a beat rate of 18,000 vibrations per hour (vph) and incorporates a sophisticated pallet lever escapement with 25 synthetic ruby jewels for reduced friction and enhanced durability.
Key Technical Highlights
Calibre: AS 1749
Movement Type: Automatic, mechanical with sweep seconds and date
Diameter: 25.60 mm (11.5 lignes)
Height: 4.60 mm
Jewels: 25 synthetic ruby jewels
Beat Rate: 18,000 vibrations per hour (vph)
Shock Protection: Incabloc anti-shock system
Lift Angle: 52°
Balance: Nickel anular balance with clockwise hairspring and movable stud
Date Setting: By changing time between 20:20 and midnight
Winding Module: Single direction (winds counterclockwise)
Common Spare Parts and Components
Mainspring and Barrel: Must precisely match original specifications for reliable torque and power reserve.
Balance Wheel and Balance Staff: Precision components requiring exact fit and quality replacement for accurate timekeeping.
Rotor Assembly and Bearings: Critical for automatic winding efficiency; worn parts must be replaced with compatible originals or high-quality NOS.
Pallet Fork and Escape Wheel: Wear-prone escapement components needing original or NOS replacements to maintain smooth operation.
Gear Train Wheels (Minute, Third, Fourth): Commonly replaced due to wear; sourced from donor movements or NOS stock.
Setting Mechanism (Stem, Crown, Levers, Springs): Must fit precisely for smooth winding, time, and date setting operations. Compatible Swiss-made winding stems are available.
Jewels: Synthetic ruby bearings arranged to minimize friction; replacement jewels must correspond to original layout and count.
Hands and Dial Components: Period-appropriate parts help maintain vintage authenticity and collector value.
Sourcing and Maintenance Tips
Use original, NOS, or donor parts labeled for AS 1749 to ensure perfect compatibility and maintain movement integrity.
Handle delicate components such as the balance wheel, escapement, and rotor assembly carefully during servicing.
Apply modern synthetic watch oils sparingly according to vintage lubrication standards to optimize longevity and performance.
Verify the calibre number stamped on the main plate before ordering parts to avoid mismatches.
Donor AS 1749 movements are valuable sources for hard-to-find or worn components.
Why AS 1749 Spare Parts Matter
Genuine spare parts preserve the calibre’s accuracy, automatic winding reliability, and mechanical durability essential for dependable function.
Proper restoration with authentic parts maintains the historical significance and collector appeal of these classic Swiss automatic watches.
The detailed technical documentation and active vintage watchmaker community support efficient parts sourcing and expert servicing.
Maintaining the A. Schild AS 1749 calibre with quality spare parts is vital for preserving the performance and heritage of these distinguished vintage automatic wristwatches.