Until today, most of the highlights of a Moritz Grossmann calibre could only be admired on the caseback side of the watch. The development of the calibre 107.0, makes them visible on the dial side for the first time.

This new calibre is a mirror image of calibre 100.1 but has been redesigned for reverse rotation so that the movement can sit ‘upside down’ in the case. An generous aperture in the dial then exposes characteristic movement details such as the Grossmann balance, the hand-engraved balance cock and the 3-band snailing on the ratchet wheel – all without taking the watch off the wrist.

Two versions have been produced, in rose gold with a grey dial, and in platinum with a blue dial.  In each case, the dial presents a full minute scale and an hour display from 11 to 5 o’clock to frame the glittering calibre presentation.  Gold hour markers and numerals match the case colour.  The recessed small seconds ring has an extravagant bearing for the second hand featuring a gold chaton.

Calibre 107.0 is essentially a mirror image of the calibre 100.1, but with crucial new design elements.  An additional wheel between the crown wheel and the ratchet wheel reverses the entire drive train with respect to the rotation of the mainspring barrel.  The wheel train runs in the right direction thanks to the mirrored escapement and the mirrored oscillation system – also including the balance spring coiling direction.

The larger dimensions of the 2/3 plate necessitated design changes for the balance cock and the escape-wheel cock. The cantilevered geometry of the escape-wheel cock creates a balanced accent in the overall arrangement of the movement. The High-Artistic finish showcases attractive hand engravings, bevels, and chamfers.

To achieve the desired presence of the winding wheels on the dial side, the dial train was reconfigured. The artistically finished train wheels were arranged beneath a lavishly polished minute-wheel bridge. Since in this case, the hand-setting mechanism is located on the opposite side of the movement, the setting wheel extends all the way through the calibre. The new arrangement created space for the optimised barrel bearing and the ratchet wheel, which was also shifted to the front side.

On the new rear side of the movement, the winding and hand-setting mechanism is now openly integrated in the train bridge, so its functionality can be fully observed for the first time. The stop-seconds and stop-balance functions have been redesigned as well.  In the hand-setting mechanism, the brake position is sampled at the clutch lever and, via a push rod, transferred to the brake spring, which then stops the balance. After the pusher is activated and the movement starts, the brake spring returns the push rod to its rest position.

The platinum version is limited to 18 pieces to celebrate our 2018 10^th anniversary.