A. Schild (AS) Calibre 1993 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1993 is an automatic Swiss mechanical movement favored for its robust construction, practical sweep seconds, and reliable quickset date function. Released around 1973, the calibre is found in a variety of classic Swiss watches and is highly regarded by collectors and watchmakers for restoration projects.
Key Technical Highlights
Calibre: AS 1993
Movement Type: Automatic, mechanical
Diameter: 25.60–26 mm (11.5 lignes)
Height: 4.60 mm
Jewels: 17, 21, or 25 synthetic ruby jewels
Beat Rate: 21,600 vibrations per hour (3 Hz)
Power Reserve: Approximately 42 hours
Functions: Hours, minutes, sweep seconds, quickset date (by repeated crown pushing)
Shock Protection: Incabloc or equivalent
Lift Angle: 52°
Period Used: ~1973
Common Spare Parts and Components
Mainspring and Barrel: NOS or original mainsprings and barrels are crucial for consistent torque and reliable power delivery.
Balance Wheel and Balance Staff: Exact fitment ensures accuracy and shock resistance; genuine/NOS parts maintain proper timing.
Automatic Rotor and Bearings: Necessary for efficient self-winding; worn rotors/bearings should be replaced with authentic or NOS units.
Pallet Fork and Escape Wheel: Escapement parts prone to wear; use original/NOS replacements for ongoing reliability.
Gear Train Wheels: Includes minute, third, and fourth wheels, all subject to replacement and available from donor or NOS sources.
Setting Mechanism (Stem, Crown, Levers, Springs): Essential for smooth winding, time, and date setting; split winding stems and hands/spares are available for AS 1993.
Jewels: Synthetic ruby bearings placed for friction reduction and durability; replacements must match original layout.
Hands and Dial Components: Period-correct hands and dial parts uphold vintage authenticity and collector value.
Date Mechanism: Key day/date components include date jumper, unlocking yoke, and date disc for quickset reliability.
Sourcing and Maintenance Tips
Secure original, NOS, or donor parts specifically made for AS 1993 to guarantee compatibility and protect movement integrity.
Handle balance assemblies, escapement, and automatic module with care during service.
Use modern synthetic watch oils as recommended in vintage service guides to enhance performance and longevity.
Always double-check the calibre number on the main plate before ordering to avoid mismatched parts.
Donor AS 1993 movements are valuable sources for harder-to-find or worn replacement pieces.
Why AS 1993 Spare Parts Matter
Using authentic spares preserves the movement’s accuracy, reliable automatic winding, and smooth quickset date function, key for restored and collectible watches.
Proper restoration with genuine components maintains the historical and collector value of these celebrated Swiss automatics.
Rich technical documentation and an active parts supply support repairs for decades to come.
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Watch Parts Enquiry
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Stem, Crown, Hands & Spares might be available for this movement.
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