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A. Schild (AS) Calibre 1727 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1727 is a vintage Swiss manual-wind mechanical movement admired for its compact design, high-beat precision, and reliability in small wristwatches. It was produced in the mid-1960s and closely relates to the AS 1726, with a beveled edge for a more refined look.
Key Technical Highlights
Calibre: AS 1727
Movement Type: Manual winding, mechanical
Diameter: 8.75 lignes (approx. 19.4mm)
Height: 3.45–3.55mm
Jewels: 17 synthetic ruby jewels
Beat Rate: 21,600 vibrations per hour (vph)
Power Reserve: 38–45 hours
Lift Angle: 52°
Functions: Hours, minutes, small seconds (sub-dial)
Shock Protection: Incabloc anti-shock system
Notable Features: Screw balance, hacking seconds, Swiss-made mid-1960s design
Common Spare Parts and Components
Mainspring and Barrel: Key to power delivery; must match original specifications. Quality replacements (NOS and aftermarket) are available for AS 1727.
Balance Wheel and Balance Staff: Delicate precision parts, crucial for timekeeping and shock absorption; demand an exact fit for reliable performance.
Pallet Fork and Escape Wheel: Wear-prone escapement components; optimal to use original or new-old-stock (NOS) replacements for smooth operation.
Gear Train Wheels (Minute, Third, Fourth): Frequently replaced due to wear; typically sourced from donor movements or NOS stock.
Click, Ratchet Wheel: Essential for winding and power retention; available as original Swiss spare parts.
Setting Mechanism (Stem, Crown, Levers, Springs): Precise fitment required for smooth winding and hands setting. Winding stems are specifically available for AS 1727.
Jewels: Synthetic ruby bearings; replacements should match original placement and number.
Hands and Dial: Period-appropriate parts preserve authenticity and value.
Sourcing and Maintenance Tips
Always use original, NOS, or donor parts labeled for AS 1727 to ensure compatibility and maintain movement integrity.
Handle delicate components such as balance and escapement with special care during servicing.
Apply modern synthetic watch lubricants sparingly in line with vintage servicing standards.
Always check the calibre number stamped on the main plate before ordering spares to avoid mismatches.
Donor AS 1727 movements are valuable for sourcing rare or worn spare parts.
Why AS 1727 Spare Parts Matter
Correct and authentic parts sustain the calibre’s accuracy, durability, and collectible value.
Specialist restoration with genuine components preserves the historical significance of these classic Swiss watches.
The design is well-documented among watchmaker communities, supporting efficient parts sourcing and expert repairs.
Maintaining the A. Schild AS 1727 with the right spare parts is essential for keeping these high-precision vintage watches operating at their best, protecting both their function and their place in Swiss horological history.