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BFG – Baumgartner 921-31/7 Watch Spare Parts: Comprehensive Overview
The Baumgartner BFG 921-31/7 is a Swiss automatic mechanical movement recognized for its reliable performance and precision. This calibre belongs to the Baumgartner 921 series, featuring a compact design suitable for vintage automatic watches with sweep second and calendar functions.
Key Specifications
Calibre: BFG 921-31/7
Movement Type: Automatic self-winding
Size: Approximately 13.5 lignes (about 30.7 mm diameter)
Beat Rate: 21,600 vibrations per hour (vph)
Jewels: Typically 1 synthetic jewel
Functions: Sweep seconds, calendar date complication
Power Reserve: Around 44 hours
Balance: Nickel anular balance with shock protection
Date Setting: Controlled by advancing time between 21:30 and midnight
Common Spare Parts
Mainspring and Barrel: Original or New Old Stock (NOS) mainsprings ensuring steady power flow.
Balance Assembly: Balance wheel, staff, hairspring, and regulator crucial for accuracy.
Rotor and Automatic Winding Components: Rotor and winding gears supporting self-winding.
Escape Wheel and Pallet Fork: Key escapement parts providing smooth operation.
Gear Train Wheels: Center, third, and fourth wheels for power transmission.
Calendar Mechanism: Date wheels, locking levers, springs, and jumpers for date function.
Setting and Winding Parts: Stem, crown, setting lever, yokes, and springs.
Hands and Dial Components: Vintage-compatible parts preserving original look.
Screws, Bridges, and Plates: Structural components for movement stability.
Maintenance and Sourcing Tips
Verify BFG 921-31/7 calibre marking before ordering parts to ensure compatibility.
Use NOS or donor parts for durability and original fit.
Take care during servicing of automatic winding and date mechanisms.
Lubricate precisely with oils suited for vintage automatic movements.
Order from trusted distributors specializing in vintage Baumgartner calibres.
Importance of Genuine Spare Parts
Authentic parts ensure precision, durability, and reliable performance.
Preserve the historic and collectible value of your vintage Baumgartner watch.
Critical for professional restoration and long-term maintenance.
Maintaining your Baumgartner BFG 921-31/7 with genuine parts supports enduring function and Swiss watchmaking heritage.
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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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