A. Schild (AS) Calibre 1873 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1873 is a vintage Swiss automatic mechanical movement highly regarded for its robust construction, reliable performance, and useful complications. Produced in the mid-20th century, it is known for its sweep seconds and date complication with quickset functionality, making it a popular choice in classic automatic wristwatches.
Key Technical Highlights
Calibre: AS 1873
Movement Type: Automatic, mechanical
Diameter: 25.60 mm (11.5 lignes)
Height: 4.10 mm
Jewels: 17, 21, or 25 synthetic ruby jewels
Beat Rate: 21,600 vibrations per hour (vph)
Power Reserve: Approximately 42 hours
Functions: Hours, minutes, sweep seconds, date with quickset (via repeated pushing of the crown)
Shock Protection: Vintage anti-shock system, often Incabloc or equivalent
Rotor: Ball-bearing type rotor for smooth automatic winding
Common Spare Parts and Components
Mainspring and Barrel: Essential for steady and reliable power delivery; original or new-old-stock (NOS) mainsprings are recommended to ensure correct torque and durability.
Balance Wheel and Balance Staff: Precision components vital for accurate timekeeping and shock resistance; must be exact fits to maintain reliability.
Rotor Assembly and Bearings: Crucial for efficient automatic winding; worn rotors or bearings should be replaced with genuine or high-quality NOS parts.
Pallet Fork and Escape Wheel: Wear-prone escapement parts; sourcing original or NOS components helps maintain smooth and reliable operation.
Gear Train Wheels (Minute, Third, Fourth): Often replaced due to wear; typically sourced from donor movements or NOS stock.
Setting Mechanism (Stem, Crown, Levers, Springs): Precision-fitted parts ensure smooth winding, time setting, and quickset date functionality. Compatible winding stems such as Part No. 401 are often available.
Jewels: Synthetic ruby bearings positioned to reduce friction; replacements must correspond exactly to the original layout to maintain movement integrity.
Hands and Dial Components: Period-correct parts preserve vintage authenticity and enhance collector appeal.
Sourcing and Maintenance Tips
Always use original, NOS, or donor parts specifically designated for AS 1873 for assured compatibility and reliability.
Handle delicate components like the balance assembly, escapement, and rotor carefully during servicing.
Apply modern synthetic watch lubricants sparingly and according to vintage lubrication standards to optimize longevity and performance.
Confirm the calibre number stamped on the movement main plate before ordering parts to avoid incompatibilities.
Donor AS 1873 movements provide valuable sources for rare, worn, or hard-to-find spare parts.
Why AS 1873 Spare Parts Matter
Genuine components ensure the calibre’s accuracy, reliable automatic winding, and durability, critical for dependable watch performance.
Proper restoration with authentic parts maintains the historical significance and collector value of these classic Swiss automatics.
Comprehensive technical documentation and an active watchmaker community facilitate efficient parts sourcing and expert repairs.
Maintaining the A. Schild AS 1873 calibre with quality, authentic spare parts is essential for preserving the legacy and reliable function of these vintage automatic wristwatches.
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Stem, Crown, Hands & Spares might be available for this movement.
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