Moritz Grossmann BENU Tourbillon Green

Grossmann Uhren, founded on 11 November 2008 by Christine Hutter, manufactures handcrafted timepieces of the highest quality with classic yet modern designs. With the BENU Tourbillon Green model the manufactory presents a special one-off piece of the most luxurious components. The watch is one of 24 unique pieces that have been made as part of Moritz Grossmann’s special tenth anniversary collection.

The dial’s striking British racing green colour was used until 1970 on British racing cars at international car races. For the BENU Tourbillon Green, the designers at Grossmann Uhren manufactory introduce the calibre 103.0 movement, which features numerous innovations. Key features include Grossmann’s three-minute tourbillon, designed by Alfred Helwig, the flying tourbillon cage with V-shaped balance bridge, the second stop with hairbrush and the duplicate minute display indicated by an extension of the minute hand.

The view of the solid silver dial in British racing green is reminiscent of the fittings in the cockpit of a racing car. Two auxiliary dials show the seconds and the hours separately. The most striking visual refinement can be found in the lower quarter of the dial in place of the 6 o’clock mark; the finely divided minute scale is interrupted by the tourbillon cut-out in the range between 25 to 35 minutes. The extension of the minute hand allows it to be precisely read in the mirrored direction on an opposite scale – a highlight that is based on the clear aesthetics of Glashütte precision measuring instruments from Moritz Grossmann’s time.

With the BENU Tourbillon Green, Grossmann Uhren Manufaktur presents a reminder of a great designer who dedicated himself less to the art of racing and more to that of watchmaking: Moritz Grossmann. As a young watchmaker he set off for London in the autumn of 1853, where he spent a year learning and working. The BENU Tourbillon Green is presented as a one-off piece in 750/000 white gold in the edition 1/1.

To celebrate the tenth anniversary, the engineers, watchmakers and designers at the Moritz Grossmann Uhren manufactory have created a special collection of 24 unique pieces including the BENU Tourbillon Green. The pieces are part of a worldwide unique advent calendar. The one-off pieces will be offered in the online auction “Winter Holiday Sale”, Sale no. 16375, at Christie’s, the world’s leading auction house, from 27th November to 10th December 2018.

Technical details

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; shockabsorbed 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

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

Three-part, in 750/000 gold
Diameter: 44.5 mm, height: 13.8 mm
Crystal/display back: Sapphire crystal, antireflective coating on one side

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

Hand-stitched alligator strap with butterfly clasp in gold

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 fourth-wheel 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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