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A. Schild (AS) Calibre 1673 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1673 is a vintage Swiss automatic mechanical movement produced between 1955 and 1963. It is valued for its reliability, classic design, and efficient self-winding mechanism. The calibre measures 26 mm (11.5 lignes) in diameter, with a height around 4.5 mm, and operates at 18,000 vibrations per hour (vph). It typically contains 17 to 25 synthetic ruby jewels, depending on the version, and has a power reserve of approximately 40 hours.
Key Technical Highlights
Calibre: AS 1673
Movement Type: Automatic, self-winding mechanical
Diameter: 26 mm (11.5 lignes)
Height: Approximately 4.5 mm
Jewels: 17, 21, or 25 synthetic ruby jewels (varies by version)
Beat Rate: 18,000 vibrations per hour (vph)
Power Reserve: About 40 hours
Shock Protection: Incabloc or equivalent
Functions: Hours, minutes, automatic winding
Production Period: Circa 1955–1963
Common Spare Parts and Components
Mainspring and Barrel: Vital to store and deliver stable power; replacements must exactly match original specs for durability and proper torque.
Balance Wheel and Balance Staff: Delicate, precision parts essential for timing accuracy and shock resistance; require exact fit and compatible shock protection.
Rotor Assembly and Bearings: Crucial for smooth automatic winding; worn rotor bearings or axles need precise compatible replacements.
Pallet Fork and Escape Wheel: Wear-prone escapement components; sourcing original or quality new-old-stock (NOS) parts enhances reliability.
Gear Train Wheels (Minute, Third, Fourth): Commonly replaced due to wear; often sourced from donor movements or NOS stock.
Setting Mechanism (Stem, Crown, Levers, Springs): Must fit perfectly for reliable winding and time-setting functions.
Jewels: Synthetic ruby bearings reduce friction; replacements must correspond to original count and arrangement.
Hands and Dial Components: Period-correct to maintain vintage authenticity and collector appeal.
Sourcing and Maintenance Tips
Use original, NOS, or donor parts specifically marked for AS 1673 to secure compatibility and preserve movement integrity.
Handle delicate components, especially balance and rotor assemblies, with care during servicing.
Apply modern synthetic watch oils sparingly following vintage lubrication standards to maximize longevity.
Always verify the calibre number stamped on the main plate before ordering to avoid incompatibility.
Why AS 1673 Spare Parts Matter
Authentic or precisely compatible parts preserve the calibre’s accuracy, automatic winding efficiency, and reliability.
Proper restoration maintains the historical significance and collector value of these classic Swiss automatic watches.
The well-documented design and active watchmaker community support facilitate parts sourcing and expert servicing.
Maintaining the A. Schild AS 1673 calibre with quality spare parts is essential for keeping these vintage automatic movements running reliably and authentically, ensuring their continued appreciation in Swiss horology.