A. Schild (AS) Calibre 1904 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1904 is a vintage Swiss manual-wind mechanical movement known for its reliability, robust construction, and practical features such as sweep seconds, day, and date complications. Primarily produced around the late 1960s and early 1970s, it is a popular calibre among collectors and watchmakers focused on restoring classic manual-wind wristwatches.
Key Technical Highlights
Calibre: AS 1904
Movement Type: Manual winding, mechanical
Diameter: 25.60 mm (11.5 lignes)
Height: 4.60 mm
Jewels: 17 or 21 synthetic ruby jewels
Beat Rate: 21,600 vibrations per hour (3 Hz)
Power Reserve: Approximately 48 hours
Functions: Hours, minutes, sweep seconds, day and date complications
Date Setting: Quickset date by changing time between 20:00 and 24:00
Shock Protection: Vintage anti-shock system, typically Incabloc or equivalent
Lift Angle: Approximately 52°
Common Spare Parts and Components
Mainspring and Barrel: Essential for stable power delivery; use original or new-old-stock (NOS) mainsprings for proper torque and durability.
Balance Wheel and Balance Staff: Precision parts crucial for maintaining accurate timekeeping and shock resistance; must be an exact fit.
Pallet Fork and Escape Wheel: Wear-prone escapement components; sourcing original or NOS parts ensures smooth and reliable operation.
Gear Train Wheels (Minute, Third, Fourth): Frequently replaced due to wear; typically sourced from donor movements or NOS stock.
Setting Mechanism (Stem, Crown, Levers, Springs): Accurate fitting parts critical for smooth winding, time setting, and day/date adjustments; winding stems such as Part No. 401 are often compatible.
Jewels: Synthetic ruby bearings positioned to minimize friction; replacements must match the original layout exactly.
Hands and Dial Components: Period-correct parts preserve vintage authenticity and enhance collector appeal.
Day and Date Components: Calendar driving wheel, date indicator, day disk, date jumper springs, and other related parts are vital for maintaining functional complications.
Sourcing and Maintenance Tips
Use original, NOS, or donor parts specifically designated for AS 1904 to guarantee compatibility and maintain movement quality and integrity.
Handle delicate components such as the balance assembly, escapement parts, and setting mechanisms with care during servicing to prevent damage.
Apply modern synthetic watch lubricants sparingly in accordance with vintage lubrication protocols to optimize longevity and performance.
Always verify the calibre number stamped on the main plate before ordering to avoid incompatibility.
Donor AS 1904 movements are valuable sources for rare or worn parts.
Why AS 1904 Spare Parts Matter
Genuine parts preserve the calibre’s accuracy, mechanical reliability, and efficient manual winding, which are critical for dependable vintage watch operation.
Proper restoration with authentic components maintains the historical significance and collector value of these classic Swiss manual-wind watches.
Well-documented technical sheets and an active watchmaker community make parts sourcing and expert servicing more efficient.
Maintaining the A. Schild AS 1904 calibre with high-quality, authentic spare parts ensures these vintage watches continue to operate reliably while honoring their place in Swiss horological heritage.
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Stem, Crown, Hands & Spares might be available for this movement.
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