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A. Schild (AS) Calibre 1051 Watch Spare Parts: Technical Overview and Sourcing Guide
A. Schild (AS) Calibre 1051 is a vintage Swiss manual-wind movement mainly used in ladies’ watches of the 1940s. Known for its compact, robust design and reliable operation, the AS 1051 requires specialized attention when sourcing genuine spare parts for restoration and maintenance.
Core Technical Highlights
Calibre: AS 1051
Dimensions: 5 3/4 x 8 3/4 lignes
Jewels: 15
Beat Rate: 18,000 A/h
Escapement: Pallet lever, nickel screw balance
Shock Protection: None
Regulation: Long regulator arm
Production Period: Mainly 1940s–1960s
Applications: Ladies’ manual-wind wristwatches
Common Spare Parts Needed
Mainspring:
Typical options include sizes like 1.50 x 0.075 x 280 x 7.5 mm, or minor variants depending on specific production runs
Balance Wheel & Hairspring:
Nickel screw type, vulnerable to shock; original replacements from donor movements are often required.
Pallet Fork & Escape Wheel:
Frequent wear due to absence of shock protection; high-precision Swiss replacements are critical.
Stem, Crown, and Setting Lever:
Setting mechanism components wear with age; spares sometimes sourced from other AS movements of similar size
Wheels (Minute, Third, Fourth):
These can develop damaged teeth or pivots; salvage or new-old-stock (NOS) parts recommended.
Jewels & Bearings:
Proper jewel count is important (typically 15); replacement jewels must be matched for fit and material.
Hands and Dials:
Period-correct spare hands and dials are rarely available new; most restored watches use spares or refinished vintage parts.
Sourcing and Interchangeability
Original AS 1051 Parts: Seek out parts labeled explicitly for AS 1051; many parts are unique due to movement size and construction
Donor Movements: The most common method for sourcing difficult components such as wheels, balance assemblies, or bridges.
Aftermarket Options: Limited for AS 1051, but basic parts like mainsprings and jewels may be available as generics—must check compatibility by precise measurement.
Watchmaker Networks & Collectors: Forums or specialist suppliers dealing in vintage Swiss parts may have limited stock.
Service Tips
Careful Handling: No shock protection—handle balance and escapement assemblies with great care during servicing
Lubrication: Use modern, light oils sparingly; original lubrication standards were minimal.
Identification: The calibre number is marked on the movement, usually under the dial, for proper identification before part ordering
A. Schild AS 1051 exemplifies mid-century Swiss technical excellence in small-form movements. Maintaining authenticity and performance requires careful restoration with period-accurate spare parts sourced either from NOS, donor movements, or specialized vintage suppliers