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To celebrate 17 years since its rebirth in 2008, Moritz Grossmann unveils a horological milestone: the PERPETUAL CALENDAR. This grand complication embodies the brand's philosophy of timeless precision, combining traditional craftsmanship with modern innovation.
The PERPETUAL CALENDAR is engineered to automatically account for the varying lengths of months and leap years, requiring no manual correction until the year 2100. This makes it one of the most technically demanding and revered complications in fine watchmaking.
The dial is a study in symmetry and clarity. A full 1–31 date scale encircles the dial, with a cup-shaped indicator framing the current date. The month and weekday are displayed on subdials at 3 and 9 o'clock, decorated with Azurage finishing. Leap year and day/night indicators are integrated into the subdials. At 12 o'clock, a poetic moon phase display features a mother-of-pearl moon gliding across a goldstone sky.
At the heart of the watch is the newly developed Calibre 101.13, a hand-wound movement based on the 100.1 calibre with an added perpetual calendar module. It comprises 401 components — 211 for the calendar module and 190 for the base movement. The movement features optimised stopwork, an integrated manual winder, and an escape wheel bearing in the barrel bridge. The finishing adheres to traditional Glashütte standards, with untreated German silver plates, raised gold chatons, and hand-engraved details.
All calendar functions can be adjusted via recessed correctors on the case, operated with a dedicated tool. A sum corrector allows for quick synchronization of all indicators after periods of inactivity.
The PERPETUAL CALENDAR is available in three elegant variants: rose gold with argenté dial (Ref. MG-003906), rose gold with anthracite dial (Ref. MG-003907), and platinum with argenté/anthracite dial (Ref. MG-003904). Each model is paired with a hand-stitched dark brown alligator leather strap and a matching prong buckle.
Moritz Grossmann continues to honour its namesake's 19th-century legacy with a commitment to "Schönstes deutsches Handwerk" — the finest German craftsmanship. The PERPETUAL CALENDAR is a testament to this enduring vision, offering collectors a timepiece that is as poetic as it is precise.
| - Hours, minutes, small seconds with stop-second - Date, day of week, month, moon phase - Leap year and day/night indicators - Grossmann manual winder with pusher |
| Calibre: | 101.13, manual winding |
|---|---|
| Regulation: | In five positions |
| Components: | 401 parts (190 base movement + 211 perpetual calendar module) |
| Jewels: | 37 jewels, including 4 gold chatons (3 screwed) |
| Escapement: | Lever escapement |
| Oscillator: | Shock-absorbed Grossmann balance with 4 inertia screws and 2 poising screws, Nivarox 1 balance spring with Breguet terminal curve |
| Frequency: | 18,000 semi-oscillations/hour |
| Power Reserve: | 42 hours |
| Case: | rose gold or platinum, three-part construction |
|---|---|
| Dimensions: | 41.0 mm diameter × 13.9 mm height |
| Dial: | Argenté or Argenté/Anthracite with radiant cut inner ring |
| Subdials: | Azurage finishing |
| Moon phase: | Goldstone sky with mother-of-pearl moon |
| Hands: | Hand-crafted rose gold or blued steel |
| Crystal: | Sapphire with anti-reflective coating (one side) |
| Strap: | Hand-stitched dark brown alligator leather with solid prong buckle in rose gold or platinum |
| - Balance staff with integrated safety roller - Glashütte-style impulse pin location - Index adjuster with fine screw - 2/3 plate inspired by historical pocket watches - Untreated German silver frame parts - Stop-second at safety roller - Hand setting override with lateral pusher - Gear wheel stopwork with two-teeth backlash |
