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Moritz Grossmann presents the first manu- facturing caliber with Tourbillon - the BENU in the third generation

The name BENU impressively marks the start of the brand MORITZ GROSSMANN GLASHÜTTE I / SA in 2010. As the first hand-held watch of the young manufactory, BENU embodies both the watchmaking precision of a Moritz Grossmann and the elegance of its timepieces as well as the conceptual claim of the Grossmann watchmakers in the 21st century: to add innovative mechanics in traditional craftsmanship using the latest techniques to exclusive fine-watchmaking compositions .

Visually, the BENU Tourbillon is all about the model line. The slim three-piece case in 750/000 white gold flows out in the gently curved impact horns. The elegant, narrow bezel sets the focus on the detailed displays and opening for the unusually large Grossmann three-minute tourbillon. The solid silver dial has three parts and is symmetrical. In order to connect the decorative element of the tourbillon to the exact statement of a precision watch at six o'clock, the seconds and hour display are located on two decentralized, deeper interpolated auxiliary dials. Your hand-made pointers are markedly differently shaped, the hour hand is more powerful according to its function, so that the reliable reading of the time is guaranteed.

The instrumental character of the BENU tourbillon is emphasized by the refraction of its fine subdivision in the bezel of the sapphire glass. The range of 25 to 35 minutes, interrupted by the Tourbillon section, can be read exactly on the opposite scale over the extension of the minute hand. This form of the two minute display is patent pending. With the distinct Arabic numerals and the self-made hand-made pointers, the BENU Tourbillon presents itself in the clear aesthetics of the Glashütter precision instruments from the 19th century.

Completely redesigned: the manufactory caliber 103.0

The movement caliber 103.0 of the BENU Tourbillon reveals a new concept and a series of surprising solutions. According to the claim of the Grossmann watchmakers to precision, efficiency and aesthetics, the classical watchmaking implementations were challenged and central functions of the clockwork were optimized.

The BENU Tourbillon is particularly distinguished by the following new developments
:

The Grossmann three-minute tourbillon after Alfred Helwig
The floating bearing tourbillon cage with v-shaped balance bridge, which is registered for the protection of the taste pattern
The second stop with hairbrush, which is patent pending
The unequal arm anchorage
The new arrangement of the Grossmann's balance and spiral with a bent end curve
The newly designed stone storage facility for the spring house
The brake ring on the second wheel of Pockholz
The ARCAP alloy for the drive wheels
The two-minute minute display by extending the minute hand, which is patented

The Grossmann three-minute tourbillon with a second stop

For the generously dimensioned oscillating system with the Grossmann's balance, a "flying" tourbillon, which is stored on one side according to Alfred Helwig, is chosen. The famous watchmaker has a particular influence on the development of the German watchmaker Glashütte. From 1913 to 1954, Alfred Helwig taught at the German watchmaker's school, in 1920 he registered the flying tourbillon as a patent. In 1922 he finished his championship with a flying five-minute tourbillon. Originally, the tourbillon serves to compensate for the gravitation-induced gait deviations in the vertically worn pocket watches. Today, a well-balanced tourbillon is one of the real challenges for the watchmakers.

The Tourbillon cage is mounted on a stepped, hand-engraved nickel silver claw. Its construction is completely re-designed and leads to a separate, functionally reduced aesthetic. The unusual size of 16 mm and its new shape are especially effective in the longer period of time. The filigree cage upper part only requires two pillars and forms a v-shaped balance bridge, which is registered as a significant feature of the taste pattern.

The complex design of the cage with two three-pronged columns is the prerequisite for a further complication. In the understanding of the Grossmann watchmakers, the precise mechanics of a tourbillon require precise adjustment of the time. In order to stop the balance, this stop device should bypass the frame pillar. An elastic brush made of human hair can easily pass the three-pronged pillar and carefully brake the balance at the circumference of its hoop. The patent-pending stop solution completes the mechanism in the sense of a Grossmann precision timepiece (this patent application is supported by SIGNO, a sponsoring initiative of the German Federal Ministry of Economics and Technology).

The unequal arm anchorage

The classic anchoring system in the BENU Tourbillon has been reworked according to the high requirements for a precise manual elevation watch. The use of unequal armature with a common resting circle means that all setting dimensions at the input and output are on the same lever arm and even small amounts can be precisely adjusted. The anchor is made of two parts: a thin anchoring fork with safety knives according to the model of the Glashütter pocket watches and the anchor body with the visible sapphire pallets. The path of the anchor is limited by a pin on the extension of the anchoring fork and thus substantially improves the center of gravity of the anchor.

The Grossmann's balance

For the BENU Tourbillon the spatial arrangement of balance and spiral in the Tourbillon cage was optimized. The spiral is fastened under the Grossmann's balance to the lower cage base so that the balance can be made even more filigree. The design of the Grossmann's balance makes it possible to optimally adjust the moment of inertia in craftsmanship and to achieve a high level of movement with a minimum air resistance and as small a mass as possible. The number of unscrewed screws has been reduced to a minimum and has been distributed with evenly distributed bores. The mass can then be adjusted and the moment of inertia can be varied by means of over-sized screws with different head heights and the bores. The Grossmann's balance works with a Nivarox 1 spiral,

The spring house storage and the glash nut lock

An extremely rare solution is used for the feather housing in the caliber 103.0 movement. The two-sided stone bearing is placed between the ratchet wheel and the work plate. A gold chaton on the ratchet wheel carries the upper bearing block for the spring house and further enhances the traditionally polished ratchet wheel. The lower bearing is completely classic in the work plate. The spring house shaft passes through the hollow-bored spring core to the Chaton in the ratchet, which means that the spring housing is perfectly stabilized with maximum bearing clearance. A modified glash nut locking mechanism ensures the tension of the tension spring. After the elevator movement, the ratchet wheel allows to go back and relax the tension spring easily. The ratchet is additionally guided by a stable steel cover.

The special features of the gear train

The wheels of the Grossmann three-minute tourbillon have several special features:

In order to reduce the movement energy of the tourbillon and to protect the anchor restraint, the rotation time of the cage is extended to three minutes via an additional wheel.

The drive for the seconds display is outside the force flow of the wheel chain and is driven with a lower torque. In order to avoid a play of shaft and second hand, the drive is constantly braked by a spring. This function is designed to make the Grossmann watchmakers permanently safe and maintenance free by using the oil-bearing pokwood (Guaiacum spp.) For the brake ring on the second shaft. Pockholz has the highest hardness "steinhart" and permanently good sliding properties. The very reliable ship and tower clocks that John Harrison successfully constructed in the 18th century serve as a model. As a trained carpenter, Harrison has gained particular knowledge about the beneficial properties of different woods, which are specially installed in his first sea chronometers.

The Grossmann precision watches of the present stand beyond our time for VALUES OF TIME. In the BENU Tourbillon, the wheels with their high-quality polishes and finishes will not lose their beauty either by oxidation or by overlapping surfaces. ARCAP, a copper-nickel-zinc alloy, is therefore used for the manufacture of the drive wheels, thus ensuring its lasting brilliance. The balance, made of beryllium bronze, receives its undisturbed appearance over the silver-colored gearwheel.

The unmistakable frame

The typical work of the Grossmann timepiece is the tradition of the Glashütter pocket chronometers. A balanced composition of the components made of natural nickel silver in different finissage forms the different levels, which are connected by two workpiles and the separately removable lift in exact distance. The fine engravings of the clockwork parts are executed exclusively by hand.

The Grossmann hand lever with lever

The high demands placed on a manual elevation watch are met by the Grossmann watchmakers with greater handling and functional safety. The Grossmann hand-operated lever with push-button mechanism incorporates a perfected pointer mechanism which eliminates two possible sources of error: the penetration of foreign particles into the housing during the setting process, as well as an unwanted movement of the hands when the elevator crown is pushed back. The mechanism switches to the cranking position after a short pull on the elevator crown and simultaneously stops the movement. The elevator crown immediately returns to its initial position, in which the hands can now be precisely adjusted. The movement is then restarted via the pusher below the elevator crown without moving it again.

The identification marks of the brand Moritz Grossmann

The BENU Tourbillon also combines the traditional characteristics of Grossmann watchmaking with modern elements of watchmaking and the typical features of the brand:

Pillarwork with 2/3-circuit board and frame pillar made of natural nickel silver
2/3-circuit board and Tourbillonkloben handgraviert
Wider, horizontal Glashütter strip cut on the 2/3-board
Modified glash nut lock with return
Separately removable coupling hoist
Protruding Goldchatons with attached screws
Brownviolet edged screws
White sapphires as storage stones
3-step stepped grounding on the ratchet wheel
Handmade steel pointer, brown violet

Design and price

BENU Tourbillon White Gold, Reference 001.G-221-11-1, dial argenté, limited to 50 watches worldwide
Price: 168.000, - Euro (recommended retail price for Germany