Product Details

The Tourbillon Bi-Cylindrique is the world's first wristwatch to feature a tourbillon with double cylindrical balance springs. The watchmakers in Villeret miniaturised and transplanted the precisely beating escapement with a cylindrical hair spring – originally developed in the 18th century for marine chronometers – into a tourbillon. Because the two cylindrical balance springs develop respiration in opposition to each other and maintain identical torque, the isochronism is even further optimized for extreme precision in the watch’s movement. A technique never before attempted in a wristwatch.

  • Ident No.: 106494
  • Calibre: MB M65.63
  • Movement Type: Manually wound movement with 1-minute tourbillon at 12 o'clock
  • Material: 18 K white gold

Movement

  • Movement Type: Manually wound movement with 1-minute tourbillon at 12 o'clock
  • Calibre: MB M65.63
  • Balance: Screw balance, Ø 14.5 mm; 59 mg.cm²
  • Power Reserve: Approx. 45 hrs
  • No. of Components: 284 components
  • Frequency: 18,000 vibrations per hour (2.5 Hz)
  • Balance Spring: Double cylindrical springs
  • Plate: Rhodium-plated German silver, circular-grained on both sides, hand-chamfered edges
  • Bridges: Rhodium-plated German silver, recesses circular-grained on both sides, hand-chamfered edges
  • Going Train: Wheels: gold-plated, circular-grained, chamfered, diamond hubs on both sides Pinions: polished faces and toothing, burnished pivots

Case

  • Material: 18 K white gold
  • Dial: Open dial to reveal the details of the "mysterious hours" mechanism
  • Sapphire Crystal: Cambered sapphire crystal
  • Crown: With Montblanc emblem in mother-of-pearl
  • Hands: Hour and minute hands indicated on "mysterious" sapphire crystal discs
  • Height: 15 mm
  • Water Resistant: 3 bar (30 m)

Bracelet/Strap

  • Material: Hand-stitched alligator-skin
  • Colour: Black
  • Clasp/Buckle: Pin buckle in 18 K white gold

Details

The Tourbillon Bi-Cylindrique is the world's first wristwatch to feature a tourbillon with double cylindrical balance springs. The watchmakers in Villeret miniaturised and transplanted the precisely beating escapement with a cylindrical hair spring – originally developed in the 18th century for marine chronometers – into a tourbillon. Because the two cylindrical balance springs develop respiration in opposition to each other and maintain identical torque, the isochronism is even further optimized for extreme precision in the watch’s movement. A technique never before attempted in a wristwatch.

  • Ident No.: 106494
  • Calibre: MB M65.63
  • Movement Type: Manually wound movement with 1-minute tourbillon at 12 o'clock
  • Material: 18 K white gold
All Details

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