Moritz Grossmann BENU Tourbillon Orange Titanium (10th Anniversary Collection, One-off Piece)

Part of Moritz Grossmann 10th anniversary collection, the unique BENU Tourbillon Orange comes with an ultra-light case made of brushed titanium and a freshly sporty look thanks to its colour combination of bright orange and grey. The orange solid silver dial is adorned with Arabic numerals and handmade hands.

The instrumental character of the BENU Tourbillon Orange is accentuated by the finely divided minute scale. The subsidiary dials for the hour and second display are grey to match the titanium case. An opening at 6 o’clock reveals Grossmann’s unusually large and flying three minute tourbillon.

The area between 25 and 30 minutes left by the tourbillon cut-out can be precisely read thanks to the extension of the minute hand on an opposite scale. Additional special features include the flying tourbillon cage with V-shaped balance bridge and the special second stop with a brush made of human hair to stop the balance.

The BENU Tourbillon Orange Titanium is offered with the calibre 103.0 in the high artistic hand finish as a single edition 1 of 1.

Technical details

BENU Tourbillon Orange Titanium

Movement
Manufacture calibre 103.0, manually wound, adjusted in five positions
Diameter: 38.4 mm, height: 7.1 mm
No. of parts: 245 (wheel train 186, cage 59)
No. of jewels: 30, 4 of which in screwed gold chatons (wheel train 17, cage 13)
Escapement: Lever escapement
Oscillator: Grossmann three-minute tourbillon with stop seconds; shock-absorbed Grossmann balance with 4 inertia and 2 poising screws, suspended Nivarox 1 balance spring with No. 80 terminal curve, Gustav Gerstenberger geometry
Cage diameter: 16.0 mm
Cage speed: 1 revolution in three minutes, anti-clockwise when viewed from dial side
Balance Diameter: 14.2 mm, Frequency: 18,000 semi-oscillations per hour
Power reserve: 72 hours when fully wound

Functions
Sweep-minutes, off-center hours and seconds, subsidiary seconds with stop seconds, Grossmann manual winder with pusher

Operating elements
Crown in 750/000 gold to wind the watch and set the time, pusher in 750/000 gold to start the movement

Case
Three-part, in titanium
Diameter: 44.5 mm, height: 13.8 mm
Crystal/display: back Sapphire crystal, antireflective coating on one side

Dial
Solid silver, three-part, orange/grey with Arabic numerals
Hands: Manually crafted, steel annealed to a brown-violet hue or stainless steel polished

Strap
Hand-stitched alligator strap with butterfly clasp in titanium

Special features
Flying three-minute tourbillon with screw-secured driving wheel and V-shaped balance bridge (design patent pending); Sweep minutes, off-center hours and seconds with stop seconds; replacement of the missing minute scale segment from 25 to 35 minutes with a separate scale swept by the extension of the minute hand on the opposite side (patent pending); Stop seconds at the balance wheel rim with a pivoting fine-hair brush (patent pending); asymmetric arm lever escapement with counterweight and lever banking pin; Grossmann balance with suspended balance spring, adjustable with poising screws in the rim; newly developed mainspring barrel jewel bearing; brake ring on the fourthwheel arbor made of very hard, oily guaiacum; ARCAP train wheels; Grossmann winder with pusher to deactivate the hand setting mode and start the movement; modified Glashütte stopwork with backlash; pillar movement with 2/3 plate and frame pillars in untreated German silver; hand-engraved 2/3 plate and tourbillon cock; broad horizontal Glashütte ribbing; 3-band snailing on the ratchet wheel; raised gold chatons with pan-head screws; white sapphire bearing jewels; separately removable clutch winding mechanism

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