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A. Schild (AS) Calibre 1651 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1651 is a vintage Swiss manual-wind mechanical movement, closely related to the AS 1650 calibre, known for its robust design and sweep seconds function. It measures approximately 25.60 mm (11.5 lignes) in diameter and is favored by collectors and watchmakers restoring mid-20th-century manual-wind watches.
Key Technical Highlights
Calibre: AS 1651
Movement Type: Manual winding, mechanical with sweep seconds
Diameter: Approximately 25.60 mm (11.5 lignes)
Functions: Hours, minutes, sweep seconds
Jewels: Typically 17 synthetic ruby jewels
Beat Rate: About 18,000 vibrations per hour (vph)
Shock Protection: Incorporated for durability and reliable operation
Common Spare Parts and Components
Mainspring and Barrel: Critical for power storage and consistent torque delivery; must match original specs exactly for optimal performance.
Balance Wheel and Balance Staff: Delicate parts crucial for accurate timekeeping and shock resistance; require precise fit and quality replacement parts.
Pallet Fork and Escape Wheel: Wear-prone escapement components; sourcing original or high-quality new-old-stock (NOS) parts is essential for smooth operation.
Gear Train Wheels (Minute, Third, Fourth): Often replaced due to wear or damage; typically sourced from donor movements or NOS stock.
Setting Mechanism (Stem, Crown, Levers, Springs): Must fit exactly to ensure reliable winding, time-setting, and smooth functionality.
Jewels: Synthetic ruby bearings arranged to minimize friction; replacement jewels must correspond to the original layout and number.
Hands and Dial Parts: Period-correct components maintain vintage authenticity and collector value.
Sourcing and Maintenance Tips
Use original, NOS, or donor parts clearly marked for AS 1651 or compatible AS calibres like AS 1650 for guaranteed fit and movement integrity.
Handle delicate components like balance wheel and escapement with care during servicing.
Apply modern synthetic watch oils sparingly, following vintage lubrication standards to optimize longevity.
Always verify the calibre number stamped on the main plate before ordering spare parts to avoid compatibility issues.
Why AS 1651 Spare Parts Matter
Authentic spare parts preserve the calibre’s accuracy, reliability, and vintage character, crucial for maintaining its mechanical integrity.
Proper restoration using genuine components supports the collector appeal and functional longevity of classic manual-wind watches.
The well-documented AS 1651 design aids in sourcing parts and expert servicing within the vintage watchmaker community.
Maintaining the A. Schild AS 1651 calibre with quality spare parts ensures these dependable vintage manual-wind watches operate reliably and authentically, preserving their place in Swiss horological heritage.