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A. Schild (AS) Calibre 1526 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1526 is a vintage Swiss manual-wind mechanical movement, notable for its flat profile and reliable performance during the 1960s. It is essentially a larger version of the AS 1525 calibre with a slightly larger base plate size, maintaining a popular design with 17 jewels and Incabloc shock protection.
Key Technical Highlights
Calibre: AS 1526 (based on AS 1525)
Movement Type: Manual winding, mechanical
Diameter: 25.2 mm (11 1/2 lignes)
Height: 2.8 mm (very flat design)
Jewels: 17 synthetic ruby jewels
Beat Rate: 18,000 vibrations per hour (vph)
Power Reserve: Approximately 44 hours
Lift Angle: 52.23°
Shock Protection: Incabloc system
Winding System: Yoke winding
Balance: Screw-less Glucydur balance with three legs
Period of Use: Circa 1960s
Common Spare Parts and Components
Mainspring and Barrel: Critical for stable power delivery; must match exact dimensions to maintain consistent torque.
Balance Wheel and Balance Staff: Delicate and essential for timing accuracy; include shock protection and require precise compatible replacements.
Pallet Fork and Escape Wheel: Wear-prone escapement parts; original or high-quality NOS parts ensure smooth operation.
Gear Train Wheels: Center, third, and seconds wheels may need replacement due to wear; often sourced from donor movements or NOS stock.
Setting Mechanism: Stem, crown, setting levers, and springs must fit perfectly for reliable winding and time-setting.
Jewels: Synthetic ruby bearings reduce friction; replacements must conform to original configuration for performance and durability.
Hands and Dial Components: Period-correct parts maintain original appearance and collector value.
Sourcing and Maintenance Tips
Prioritize original or NOS parts explicitly marked for AS 1526 or AS 1525 for guaranteed compatibility.
Donor movements are valuable for rare or worn components such as balance assemblies and gear wheels.
Handle delicate parts like the balance and escapement with care during maintenance.
Apply modern synthetic watch oils sparingly, following vintage lubrication standards to maximize movement longevity.
Always verify the calibre number stamped on the main plate before ordering to avoid ordering incompatible parts.
Why AS 1526 Spare Parts Matter
Preserving genuine or precise compatible parts ensures the calibre’s renowned accuracy and reliable manual winding performance.
Correct restoration maintains the vintage watch’s authenticity and collector appeal.
The AS 1526’s well-documented construction facilitates effective sourcing and servicing within watchmaker communities.
The A. Schild AS 1526 remains a respected vintage calibre whose longevity depends on careful sourcing and fitting of quality spare parts to uphold its reliable operation and historical value.