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BFG – Baumgartner 921/31 Watch Spare Parts: Comprehensive Overview
The Baumgartner BFG 921/31 is a Swiss automatic watch movement prized for its precision, compact design, and reliable mechanical construction. It belongs to the Baumgartner 921 family, known for vintage automatic calibres with sweeping seconds and date functions.
Key Specifications
Calibre: BFG 921/31
Movement Type: Automatic self-winding
Size: Approximately 9.75 lignes (21.5 mm diameter)
Beat Rate: 21,600 vibrations per hour (vph)
Jewels: Typically 1 synthetic jewel
Functions: Sweep seconds, date function with time-based setting (21:30–24:00)
Power Reserve: Around 44 hours
Balance: Nickel anular balance with shock protection
Date Setting: Date set by changing time between 21:30 and midnight for quick correction
Common Spare Parts
Mainspring and Barrel: Original or New Old Stock (NOS) mainsprings for consistent and durable power.
Balance Assembly: Balance wheel, staff, hairspring, and regulator maintaining precise timing.
Rotor and Automatic Winding Parts: Rotor, winding gears, and reverser wheels critical for automatic operation.
Escape Wheel and Pallet Fork: Essential escapement parts for smooth mechanical movement.
Gear Train Wheels: Power transmission wheels including center, third, and fourth wheels.
Date Mechanism: Date discs, jumpers, springs, and locking levers allowing reliable date changes.
Setting Mechanism: Stems, crowns, setting levers, and springs for manual winding and time setting.
Hands and Dial Components: Authentic vintage-revision or replacement parts maintaining original style.
Screws, Plates, and Bridges: Structural parts ensuring assembly integrity.
Maintenance and Sourcing Tips
Verify the BFG 921/31 calibre marking for ordering correct spare parts.
Prefer NOS or reliable donor parts for lasting performance and compatibility.
Handle automatic winding and date mechanisms gently during servicing to prevent damage.
Lubricate with suitable oils specifically formulated for vintage automatic movements.
Trusted vintage watch parts suppliers offer a broad selection of Baumgartner components.
Importance of Genuine Spare Parts
Guarantees accuracy, longevity, and reliable operation of the watch.
Maintains the historical and collector value of this vintage Swiss timepiece.
Supports professional restoration and long-term wearability.
Using authentic parts for your Baumgartner BFG 921/31 ensures precise function and preserves its place in Swiss horological 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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