TEFNUT Twist

Versions

  • ROSE GOLD <br> CLASSIC

    ROSE GOLD
    CLASSIC

  • WHITE GOLD <br> CLASSIC

    WHITE GOLD
    CLASSIC

  • ROSE GOLD <br> FANCY

    ROSE GOLD
    FANCY

  • WHITE GOLD <br> FANCY

    WHITE GOLD
    FANCY

  • ROSE GOLD <br> GENT

    ROSE GOLD
    GENT

  • WHITE GOLD <br> GENT

    WHITE GOLD
    GENT


Grossmann‘s watchmakers fulfilled a long-standing wish when they created the innovative winding mechanism for the TEFNUT. The quest for a robust alternative to the conventional crown winder ended with an exceptionally original solution: The Grossmann strap winder makes it possible to wind the watch hands down, so to speak, with just a few turns of the strap attachment at 6 o‘clock.

To enable this remarkable feat, the calibre 102.2 was extensively reworked and the exterior form of the TEFNUT modified. A first glance is enough to see that the Grossmann strap winder has strikingly different strap attachment points and an unusual setting crown position. With its three distinctive versions – „Classic“, and „Fancy“, and „Gent“ – in rose-gold or white-gold cases, the TEFNUT Twist stands out prominently in terms of both appearance and mechanical ingenuity.

The Case

The Case

The TEFNUT Twist remains true to the slender design vocabulary of its family and attracts attention with charming elegance. Its bezel and the striking strap attachments please the eye with balanced proportions. With the seconds subdial at 7 o‘clock and the setting crown at 4 o‘clock, the visual focus is subtly shifted to the strap winder.

To assure that the strap comfortably hugs the wrist, both the winding stem and the strap bar on the opposite side are inclined inward by 22°. Depending on the version, the strap bar tips are fitted with gold screws or, like the crown, with glowing precious stone cabochons, identifying the TEFNUT Twist as a manifestation of pure watchmaking artistry.

THE GROSSMANN STRAP WINDER

THE GROSSMANN STRAP WINDER

As simple as it may seem, the concept of winding with „a twist of the wrist“ calls for an elaborate mechanism. The power needed to tension the mainspring is built up with the winding stem that enters the case at 6 o‘clock. Via a wheel train that is visible on the movement side of the watch, it transmits the power to the spring barrel. When winding with partial turns of about 90°, the strap can deliver much more torque than a crown because it is easy to grasp. The energy is transmitted via a bevel gear with a high-efficiency ratio. Moreover, a backstop ratchet allows bidirectional winding. Thus, all it takes to wind the TEFNUT Twist is a few turns in both directions.

THE SETTING CROWN

THE SETTING CROWN

Since the strap winder gear ratio is not suitable for handsetting, the winding and setting functions were separated in the TEFNUT Twist. As usual, the hands are set with the crown, which is in the less exposed 4 o‘clock position. When the crown is pulled, the clutch lever engages the sliding pinion with the setting wheels and activates the stop seconds mechanism. A spring firmly attached to the main plate presses against the safety roller and thus prevents inadvertent contact with the polished outer surface of the balance-wheel rim or maladjustment of the delicate poising screws. Once the hands have been set, the setting crown is pushed home again to restart the movement.

The MG calibre 102.2

The MG calibre 102.2

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Versions

  • ROSE GOLD <br> CLASSIC

    Version: Classic
    Reference: MG-000951
    Case: 750/000 rose gold
    Dial: argenté
    Hands: manually crafted, steel annealed to a brown-violet hue

  • WHITE GOLD <br> CLASSIC

    Version: Classic
    Reference: MG-001233
    Case: 750/000 white gold
    Dial: argenté
    Hands: manually crafted, steel annealed to a brown-violet hue

  • ROSE GOLD <br> FANCY

    Version: Fancy
    Reference: MG-001165
    Case: 750/000 rose gold
    Dial: Mother of pearls, with brilliantcut diamonds
    Hands: manually crafted, steel annealed to a brown-violet hue

  • WHITE GOLD <br> FANCY

    Version: Fancy
    Reference: MG-001232
    Case: 750/000 white gold
    Dial: Mother of pearls, with brilliantcut diamonds
    Hands: manually crafted, steel annealed to a brown-violet hue

  • ROSE GOLD <br> GENT

    Version: Gent
    Reference: MG-001167
    Case: 750/000 rose gold
    Dial: argenté
    Hands: manually crafted, steel annealed to a brown-violet hue

  • WHITE GOLD <br> GENT

    Version: Gent
    Reference: MG-01231
    Case: 750/000 white gold
    Dial: argenté
    Hands: manually crafted, steel annealed to a brown-violet hue

Tech Specs

  • Movement Manufacture calibre 102.2, manually wound, adjusted in five positions
  • No. of parts 200
  • No. of jewels 19, of which 3 in screwed gold chatons
  • Escapement Lever escapement
  • Oscillator Shock-resistant Grossmann balance with 4 inertia and 2 poising screws, Nivarox 1 balance spring
  • Balance Diameter: 10.0 mm, Frequency: 21,600 semi-oscillations per hour
  • Power reserve 48 hours when fully wound
  • Functions Hours and minutes, subsidiary seconds with stop seconds
  • Operating elements Crown in 750/000 gold to set the time at 4 o‘clock,
  • Case dimensions Diameter: 36.0 mm, height: 9.64 mm
  • Movement dimensions Diameter: 26.0 mm, height: 4.2 mm
  • Case Three-part, in 750/000 gold
  • Dial argenté or faced with mother of pearl and set with brilliant-cut diamonds
  • Hands Hand-crafted, steel, annealed to a brownviolet hue
  • Crystal and display back Sapphire crystal, antireflective coating on one side
  • Strap Hand-stitched alligator or satin strap with prong buckle in precious metal
  • Special Features Rapid winding with rotatable strap attachment at 6 o‘clock / winding via bevel gear set and winding transmission with backstop ratchet / stopwork with sawtooth wheels / mainspring with bridle / subsidiary seconds at 7 o‘clock / handsetting via crown at 2 o‘clock / shock-resistant balance with inertia and poising screws / flat balance spring, impulse pin attached to rim / balance staff with an integrated space-saving single safety roller instead of the conventional double roller / index adjuster with micrometer screw / plate movement with 3/5 plate / frame pillars and separately removable winder module / frame parts in untreated German silver / raised gold chatons with pan-head screws / stop seconds at the safety roller when the crown is pulled