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A. Schild (AS) Calibre 1315 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1315 is a vintage Swiss automatic mechanical movement produced in the early 1950s, belonging to the ETA family 1306-1320 series. It is known for its robust construction, reliable automatic winding, and sweep seconds function, making it a valued choice among mid-century wristwatch collectors and repairers.
Key Technical Highlights
Calibre: AS 1315
Movement Type: Automatic, self-winding mechanical
Diameter: 12.5 lignes (approximately 28 mm)
Height: About 6.3 mm
Jewels: 17 synthetic ruby jewels
Beat Rate: 18,000 vibrations per hour (vph)
Power Reserve: Approximately 33 hours
Period of Production: Circa 1951–1953
Winding System: Traditional automatic with a sweep seconds display
Common Spare Parts and Service Components
Mainspring and Barrel: Critical for power storage and transmission; mainsprings may require replacement due to age-related fatigue or breakage.
Balance Wheel and Balance Staff: Essential for timing accuracy; prone to shock damage, requiring exact replacements matched to the original specifications.
Pallet Fork and Escape Wheel: Prone to wear given the movement’s oscillations; sourcing original or compatible parts is important for reliable escapement operation.
Wheels (Minute, Third, Fourth): Susceptible to wear or damage; often sourced from donor movements or new-old-stock (NOS) to maintain precision.
Stem, Crown, and Setting Mechanism: Important for winding and time setting; these components typically wear and require precise matching replacements.
Jewels: Replacement ruby bearings maintain movement durability and smooth gear train operation.
Rotor and Automatic Winding Components: Wear on rotor axle or bearings can reduce winding efficiency and needs expert inspection and replacement as needed.
Hands and Dials: Period-appropriate hands and dials help preserve vintage aesthetics during restoration.
Sourcing and Maintenance Tips
Original Parts: Prefer parts explicitly designed and labeled for AS 1315 to ensure compatibility and preserve authenticity.
Donor Movements: Non-working or damaged AS 1315 calibers are valuable sources for hard-to-find components.
Handling: The movement’s balance and escapement components require careful handling during servicing due to delicate shock resistance.
Lubrication: Use modern synthetic oils sparingly, respecting the vintage lubrication standards for longevity and reliability.
Identification: The AS 1315 calibre number is typically stamped on the movement’s main plate and is essential for accurate parts ordering.
Why AS 1315 Spare Parts Matter
Robustness and Reliability: Maintaining original-quality parts ensures the movement’s well-known reliability and precise timekeeping.
Collector Appeal: Correct restoration with authentic parts enhances the historical value and keeps the movement functioning as designed.
Watchmaker Familiarity: AS 1315 is well regarded in vintage watch repair circles, easing parts sourcing and servicing.
The A. Schild AS 1315 remains a distinguished automatic watch movement from the 1950s. Accurate and quality spare parts sourcing is essential to retain its performance, authenticity, and collectible status.