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A. Schild (AS) Calibre 1720 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1720 is a vintage Swiss manual-wind mechanical movement notable for its compact size and reliability. It measures approximately 13.00 x 15.15 mm in dimension and operates at a higher beat rate of 21,600 vibrations per hour (vph), which provides enhanced accuracy compared to many contemporaries. This calibre is favored for small wristwatches requiring a precise and robust manual winding movement.
Key Technical Highlights
Calibre: AS 1720
Movement Type: Manual winding, mechanical
Dimensions: 13.00 x 15.15 mm
Beat Rate: 21,600 vibrations per hour (vph)
Functions: Hours, minutes, small seconds (typical for manual calibres of this size)
Shock Protection: Often equipped with vintage anti-shock systems (such as Incabloc)
Era: Mid-20th century
Common Spare Parts and Components
Mainspring and Barrel: Essential for power storage and delivering consistent torque; replacements must meet original specifications exactly for performance and durability.
Balance Wheel and Balance Staff: Critical precision parts that ensure accurate timekeeping and shock resistance; require exact fit and quality compatible parts.
Pallet Fork and Escape Wheel: Wear-prone escapement components that must be replaced with original or high-quality new-old-stock (NOS) parts for smooth operation.
Gear Train Wheels (Minute, Third, Fourth): Frequently need replacement due to wear or damage; commonly sourced from donor movements or NOS stock.
Setting Mechanism (Stem, Crown, Levers, Springs): Precise fit parts required for reliable winding and time adjustment.
Jewels: Synthetic ruby bearings positioned to reduce friction and wear; replacement jewels must correspond exactly to the original layout.
Hands and Dial Components: Period-correct parts help maintain vintage authenticity and collector appeal.
Sourcing and Maintenance Tips
Use original, NOS, or donor parts explicitly marked for AS 1720 to ensure compatibility and preserve the integrity of the movement.
Handle delicate components like the balance wheel, escapement, and setting lever with care during servicing to avoid damage.
Apply modern synthetic watch oils sparingly, respecting vintage lubrication practices to extend movement longevity.
Verify the calibre number stamped on the main plate before ordering parts to prevent compatibility issues.
Donor AS 1720 movements can be valuable sources for hard-to-find or worn components.
Why AS 1720 Spare Parts Matter
Authentic parts preserve the calibre’s accuracy, mechanical reliability, and longevity, critical for proper function.
Proper restoration using genuine components maintains the historical significance and collectible value of these classic Swiss manual-wind watches.
The well-documented technical details and active vintage watchmaker community facilitate reliable sourcing and expert servicing.
Maintaining the A. Schild AS 1720 calibre with quality spare parts is essential for preserving the performance and heritage of these robust vintage manual-wind movements.