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.

TEFNUT Twist

 29.900,00 34.300,00

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Details

Version

Rose gold Classic, Rose gold Fancy, Rose gold Gent, White gold Classic, White gold Fancy, White gold Gent

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

Oscillation system

Nivarox 1 balance spring, Shock-resistant Grossmann balance with 4 inertia and 2 poising screws

Balance

Diameter: 10.0 mm, Frequency: 21,600 semi-oscillations per hour

Power reserve

48 hours when fully wound

Operating elements

crown at 4 o'clock to set the time, rotatable strap attachment for winding the watch

Functions

Hours and minutes, subsidiary seconds with stop seconds

Case

750/000 gold, three part

Case Dimensions

Diameter: 36.0 mm, height: 9.64 mm

Movement dimensions

Diameter: 26.0 mm, height: 4.2 mm

Dial

argenté, faced with mother-of-pearl, set with brilliant-cut diamonds

Hands

annealed to a brown-violett hue, Hand-crafted, polished steel

Glass and Caseback

Sapphire crystal, antireflective coating on one side

Special Features

adjustment with Grossmann micrometer screw on a cantilevered balance cock, raised gold chatons with pan-head screws, balance staff with an integrated space-saving single safety roller instead of the conventional double roller, frame parts in untreated German silver, handsetting via crown at 4 o‘clock, impulse pin attached to rim, mainspring with bridle, plate movement with 3/5 plate and frame pillars, rapid winding with rotatable strap attachment at 6 o‘clock, shock-resistant balance with inertia and poising screws, stop seconds at the safety roller when the crown is pulled, stopwork with sawtooth wheels, subsidiary seconds at 7 o‘clock, winding via bevel gear set and winding transmission with backstop ratchet

Strap

alligator leather, hand-stiched

Strap color

Black, Dark Brown, Red Brown, White

Closer

Prong buckle

Closer material

750/000 gold