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A. Schild (AS) Calibre 1690 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1690 is a vintage Swiss manual-wind mechanical movement well-regarded for its reliability and classic design. Produced around the 1960s, this calibre features a diameter of approximately 23.7 mm (10.5 lignes) and operates at a beat rate of 18,000 vibrations per hour (vph). It typically comes with 15, 17, or 21 synthetic ruby jewels and offers a power reserve of about 50 hours. The movement is valued by collectors and watchmakers restoring vintage timepieces.
Key Technical Highlights
Calibre: AS 1690
Movement Type: Manual winding, mechanical
Diameter: Approximately 23.7 mm (10.5 lignes)
Jewels: 15, 17, or 21 synthetic ruby jewels
Beat Rate: 18,000 vibrations per hour (vph)
Power Reserve: About 50 hours
Lift Angle: 52 degrees
Function: Hours, minutes, sub-seconds
Height: Approximately 4.0 mm
Common Spare Parts and Components
Mainspring and Barrel: Key for stable power storage and energy release; replacements must fit original dimensions to maintain torque and consistency.
Balance Wheel and Balance Staff: Delicate parts vital for precise timekeeping and shock resistance; sourcing original or quality new-old-stock (NOS) is recommended.
Pallet Fork and Escape Wheel: Wear-prone escapement parts requiring authentic or NOS replacements for smooth function.
Gear Train Wheels (Minute, Third, Fourth): Often replaced due to wear or pivot issues; donor movements and NOS stock are common sources.
Setting Mechanism (Stem, Crown, Levers, Springs): Precise fit parts essential for proper winding and time setting.
Jewels: Synthetic ruby bearings arranged to minimize friction; replacements must match original count and layout.
Hands and Dial Components: Period-correct parts maintain vintage authenticity and collector appeal.
Sourcing and Maintenance Tips
Use original or NOS parts specifically designated for AS 1690 to ensure compatibility and maintain movement integrity.
Donor AS 1690 movements are valuable for harvesting rare or worn components.
Handle fragile parts like the balance wheel and escapement carefully during servicing.
Apply modern synthetic lubricants sparingly, following vintage standards to prolong the movement’s life.
Confirm the calibre number stamped on the main plate before ordering parts to avoid mismatches.
Why AS 1690 Spare Parts Matter
Authentic parts ensure the movement’s accuracy, reliability, and longevity.
Proper restoration with genuine components upholds the collector value and mechanical heritage of vintage Swiss watches.
The documented technical profile of AS 1690 enables informed repairs and parts sourcing among watchmakers.
Maintaining the A. Schild AS 1690 with quality spare parts is crucial for preserving these classic manual-wind mechanical watches, ensuring they continue to function with precision and historical authenticity.