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Oster Jewelers will be closed Sunday, April 7 - Tuesday, April 23, 2024. Re-Open Wednesday April 24.
Oster Jewelers will be closed Sunday, April 7 - Tuesday, April 23, 2024. Re-Open Wednesday April 24.

Moritz Grossmann Backpage Platinum | LE18

$ 57,800.00
SKU 27373
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Pure watch artistry has achieved a new presence with the accomplishment of the calibre 107.0 manufacture movement, showcase on the Moritz Grossmann Backpage Platinum. The development of the mirrored calibre allows for the exquisite display of various highlights that until recently could only be seen through the display back. The "back page" brings these details, like the hand-engraved balance cock front and center on the wrist, allowing the wearer to admire the inner workings of the watch without having to undo the strap.

A limited edition of 18 pieces.
Ref. MG-001642

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.

Both the design and construction of the balance cock and escape-wheel cock were adapted to the larger dimensions of the 3/4 plate. The escapement wheel and the cantilevered balance cock with its hand-engraved, floral pattern create a balanced accent in the overall arrangement of the movement. The High-Artistic finish showcases attractive hand engravings, bevels, and chamfers.

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. Almost all parts are mirrored in order to guarantee their function even when mounted in the opposite position while ensuring the position of the lever remains unchanged.

- Manufacture calibre 107.0
- Manually wound
- Adjusted in five positions
Movement dimensions
- 36.4 mm diameter
- 5.0 mm height
Special features
- Shock-resistant balance with inertia and poising screws, impulse pin integrated in rim
- Flat balance spring
-  Balance staff with integrated safety roller
- Index adjuster with Grossmann micrometer screw
- Plate movement with 2/3 plate on dial side
- Frame pillars and separately removable clutch winding mechanism
- Visible handsetting train on the back side of the movement
- Frame parts in untreated German silver
- Grossmann winder with pusher and stop seconds
- Raised gold chatons with pan-head screws
- Remodified Glashütte stopwork with backlash
- Mainspring barrel with bilateral jewel bearings for optimised power management in the low-torque range
- ARCAP train wheels
- Proprietary escapement with 18-tooth escape wheel
- Balance cock and crown wheel, intermediate winding wheel and ratchet wheel with stopwork on the modified spring barrel bearing with a gold chaton in the ratchet wheel
- Dial train wheels spoked and beveled, beneath polished bridge
- Hours, minutes, and subsidiary seconds with stop seconds
- Grossmann winder with pusher
No. of parts
No. of jewels
24, of which 7 in screwed gold chatons
Lever escapement
Shock-resistant Grossmann balance with 4 inertia and 2 poising screws
- Nivarox 1 balance spring with No. 80 Breguet terminal curve
- Gerstenberger geometry
- Diameter  14.2 mm
- Frequency 18,000 semi-oscillations/hour
Power reserve
42 hours when fully wound
Operating elements
- Crown in precious metal, for winding the watch and setting the time
- Pusher in precious metal for starting the movement
Platinum, three-part
- 41.00 mm diameter
- 11.35 mm height
- Solid silver
- Baton hour markers in precious metal
Manually crafted, steel, polished, annealed to a blue hue
Crystal/display back
Sapphire crystal, antireflective coating on one side
Hand-stitched alligator strap with prong buckle in precious metal
18 watches worldwide

Oster Jewelers is an authorized Moritz Grossmann Retailer