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A. Schild (AS) Calibre 1250 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1250 is a vintage Swiss automatic mechanical movement produced primarily between 1960 and 1975. Known for its robust build and reliable automatic winding, it was used in various wristwatches, including chronometers, and offers practical features like a date display and sweep seconds.
Key Technical Highlights
Calibre: AS 1250
Type: Automatic winding movement with hammer (bumper) rotor
Diameter: 24.8 mm (11 lignes)
Height: 5.55 mm
Jewels: 15 or 17
Beat Rate: 18,000 vibrations per hour (vph)
Power Reserve: Approximately 32 hours
Functions: Hours, minutes, sweep seconds, date display (date can be set via time adjustment between 23:00-24:00)
Special Features: Choice of bevelled or plane date discs, incabloc shock protection, pinned regulator
Common Spare Parts
Mainspring and Barrel: Essential for power storage and force transmission; typically sized 1.20 x 0.105 x 340 mm.
Balance Assembly & Staff: Includes balance wheel with Incabloc shock absorber; critical for maintaining accuracy.
Pallet Fork and Escape Wheel: Wear-prone parts requiring precise compatibility for smooth escapement operation.
Wheels: Minute, third, fourth, and hour wheels, often sourced from donor movements or new old stock (NOS).
Date Components: Date dial, date drive wheels, date jumper, date jumper spring, date indicator guard integral to proper date function.
Setting Mechanism Parts: Stem, crown, setting lever and springs, clutch wheel, clutch lever, ratchet wheel, click and clickspring essential for winding and hand setting.
Jewels: Synthetic ruby bearings for smooth gear trains and durability.
Oscillating Weight (Rotor) and Related Axle/Bolt: Key automatic winding components subject to wear.
Screws & Bridges: Movement assembly components, often needed for repairs or restoration.
Sourcing and Maintenance Tips
Use Original or NOS Parts: To maintain authenticity and ensure proper fit, source parts specifically marked for AS 1250.
Donor Movements: Non-running AS 1250 movements are valuable sources for hard-to-find components.
Careful Handling: With automatic and shock-sensitive balance assemblies, expert handling is critical during disassembly and servicing.
Lubrication: Apply modern synthetic oils sparingly, respecting the original lubrication standards to maintain longevity.
Identification: Calibre number is usually stamped on the main plate, essential for accurate parts ordering.
Why AS 1250 Spare Parts Matter
Robust Automatic Movement: Preserves the reliable functionality and engineering of a mid-20th-century automatic calibre.
Collector and Watchmaker Value: Authentic parts maintain the movement’s historical integrity and ease of repair among vintage watch specialists.
Date Functionality: Proper date components ensure smooth and accurate date changes, enhancing user experience and movement reliability.
This guide supports collectors and watchmakers in maintaining the A. Schild AS 1250 as a functional and authentic vintage timepiece through accurate spare parts sourcing and care.