New: Moritz Grossmann Hamatic Astral Sincere Platinum Jubilee Edition

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Moritz Grossmann releases a 10 piece limited edition Hamatic Astral to celebrate the Sincere Fine Watches’ 70th Anniversary.

Press Release information with commentary in italics.

New: Moritz Grossmann Hamatic Astral Sincere Platinum Jubilee Edition

The Moritz Grossmann Hamatic Astral Sincere Platinum Jubilee Edition Ref. MG-003621 will retail at SGD 102,000 inclusive of GST. Limited Edition of 10 pieces available exclusively at Sincere Fine Watches and SHH Boutiques.


The novelty is a new dial variation for the beautiful Hamatic collection. We reviewed the Hamatic in detail here, which will provide a good base to understand the watch. This special Sincere edition is the very same watch. Same case.

The movement also remains unchanged. This is the very beautifully laid out and horologically interesting Cal. 106.0. The case back crystal now carries the Sincere logo embossed on the under side.

What is new is the aventurine dial, also known as goldstone. This is the first time Moritz Grossmann is using this material as the dial. The dial looks magnificent, and quite similar to what their German neighbour A. Lange & Söhne has done for the Saxonia Thin and the Little Lange 1 Moonphase. An interesting side note that the name town of Glashütte, where Moritz Grossmann (and Lange) hail from, is derived from “glas” and “hütte”, meaning glass works in English. Probably in reference to the town being a producer of glass in former times.

Pricing wise, the recommended retail seems to have risen considerably. The standard model in rose gold retailed at SGD 71k as we reviewed in 2022. We do not have the current list price in SGD, but the Hamatic in rose gold is currently listed as EUR 61.5k (about SGD 90k) inclusive of 19% VAT in the M. Grossmann online boutique. Compare to this novelty’s SGD 102k (inclusive of 9% GST), with the only value added is in the aventurine (goldstone) dial and limited edition status.

Release information

To commemorate Sincere Fine Watches’ 70th anniversary, Moritz Grossmann introduces the enchanting HAMATIC Astral Sincere Platinum Jubilee Edition. With its captivating goldstone dial, one can experience the passage of time against a celestial backdrop of shimmering brilliance. This extraordinary timepiece showcases the artistry of watchmaking, delivering a captivating aesthetic affirmed by exemplary craftsmanship.As time unravels, fleeting moments transition from future to present to past, leaving glimmering memories akin to stars in the night sky. With the HAMATIC Astral Sincere Platinum Jubilee Edition, Moritz Grossmann celebrates not only 70 years of Sincere’s dedication to developing watch appreciation in the region but also reflects the retailer’s anticipation of the limitless opportunities ahead. In this exceptional creation, the brand seamlessly merges this poetic essence with groundbreaking mechanical precision, crafting an enchanting masterpiece that not only highlights the German manufacturer’s technical prowess but also exemplifies the strong partnership between the brand and the retailer.

The Moritz Grossmann HAMATIC Astral Sincere Platinum Jubilee Edition marks the first time goldstone has been selected as a watch dial material for the entirety of the manufacture’s collection.

Universe in Motion: Shimmering goldstone dial

With the HAMATIC Astral, this marks the debut of a goldstone dial for Moritz Grossmann’s watches. Regardless of the viewing angle, the goldstone dial exhibits a subtle yet captivating variation. The array of luminous dots, set against a midnight blue backdrop in hues of gold and blue, evoke the image of the galaxy with its myriad of stars and cherished moments collected over time. The galaxy-esque goldstone dial acts as a symbolic portal, offering a simultaneous glimpse into the past, present, and future—making it the perfect representation of Sincere Fine Watches’ 70 years of history and rich heritage.

The making of goldstone: Crafted through the art of glassmaking The manufacturing process of goldstone mirrors the rich tradition of watchmaking itself. Discovered serendipitously in 17th-century Venice, goldstone is produced by heating glass with the addition of copper, carefully controlled to prevent overheating. The result: tiny crystalline clusters, reminiscent of glitter, embedded within the material. Its versatility in cutting, polishing, or casting makes goldstone an ideal choice for watch dials.

In this timepiece, the goldstone perfectly complements its vintage design, radiating an aura of elegance and refinement. Enhanced by gold-tone appliqués and a vintage “M. Grossmann” logo, the watch features meticulously crafted rose gold poiré-shaped hands. Its aesthetic and cohesive design language pay homage to the illustrious history of the German manufacture, evolving with modern machinery while remaining rooted in captivating tradition.

Inspired by the World’s First Automatic Movement

Throughout history, many have been intrigued by the concept of perpetual motion that is not propelled by any external energy source. In the realm of horology, this fascination found expression in the ingenious utilization of kinetic energy from wearers. Dating back to the 18th century, the pioneers of watchmaking introduced the world’s first automatic watches by ingeniously employing a pendulum in the form of a hammer equipped with a heavy head to harness the kinetic energy generated through the wearer’s movement.

Drawing inspiration from this traditional concept, engineers at Grossmann paid homage to horological heritage with the introduction of the calibre 106.0. This remarkable movement not only showcases the intricate mechanics synonymous with the brand’s craftsmanship, but also revives the aesthetic allure of the hammer-style pendulum system. Encased within an elaborately designed frame, meticulously finished, and left open in the center, the calibre 106.0 unveils the mesmerizing interplay of the hammer spring and the striking gold hammer head.

Through the transparent sapphire crystal display back, observers of the timepiece can witness the rhythmic dance of the pendulum system—a testament to Moritz Grossmann’s commitment to both innovation and tradition.

Form and Function: Calibre 106.0

The bidirectional automatic hammer mechanism of the HAMATIC movement ensures exceptionally efficient winding, delivering consistent winding power for a highly precise and reliable movement.

With a power reserve of 72 hours when fully wound, the timepiece can autonomously run for an entire weekend or three days with minimal movement from the wearer.

One key advantage of the hammer-style pendulum system lies in the strategic placement of the hammer’s center of mass relative to its rotational axis. The Calibre 106.0 has been intentionally designed with this layout to generate significant torque, enabling it to exert a potent force on the spring. Even with minimal movement—just a five-degree shift from its origin or a two-millimeter oscillation—the kinetic energy is efficiently stored in the mainspring of the movement.Crafted by Moritz Grossmann, this mechanism has been optimized to capture various forms of movement. Stronger movements, characterized by larger deflections of the hammer body, are carefully attenuated by intricately crafted fixed end springs within the hammer frame. Meanwhile, subtler movements result in a smaller swing radius, significantly minimizing friction loss and ensuring more efficient energy transmission.

In addition to its self-winding capability, the watch features a manual winding function facilitated by a yoke winder mounted on a separate bridge. This design ensures that the manual winder always remains disengaged from the ratchet wheel when the HAMATIC system is activated by motion. On the other hand, when in manual winding mode, the reduction gear is isolated from the ratchet wheel by the backstop ratchet.

With the Moritz Grossmann HAMATIC Astral Sincere Platinum Jubilee Edition, the serial number is engraved on the back of the rose gold case by hand. The timepiece comes with a dark blue strap made from alligator leather and has Sincere’s 70th anniversary logo engraved on the open caseback.

Moritz Grossmann Hamatic Astral Sincere Platinum Jubilee Edition Specifications


Movement Manufacture Calibre 106.0, automatic winding, regulated in five positions

Power Reserve 72 hours

Frequency 21,600 vph (3 Hz)

Components 312

Jewels 38, with 3 in screwed gold chatons

Diameter 36.4 mm

Thickness 5.15 mm

Escapement Lever Escapement

Oscillator Shock-resistant Grossmann balance (10mm diameter) with 4 inertia

screws and 2 poising screws, Nivarox 1 balance spring

Hands Handmade, Gold

Complications Hour and Minutes, Small Seconds with Hacking, Hammer Style Pendulum Winding System

Special Features

Grossmann balance; click pawl in reduction gear; adjustment with Grossmann micrometer screw on cantilevered balance cock; pillar movement with 2/3 plate and pillars made of untreated German silver, hand-engraved 2/3 plate and cantilevered balance cock; wide, horizontal Glashütte ribbing, double-band snailing on the mainspring barrel; raised gold chatons with pan-head screws; separately removable yoke winder; stop seconds for hand setting; automatic winding with oscillating hammer, bidirectional click wheels; idler with pawl clicks, manual yoke winder


Case Three-part, in 750/000 gold

Diameter 41 mm

Thickness 11.35 mm

Crown 750/000 gold

Caseback Sapphire Crystal Display Caseback with antireflective coating

Water Resistance 30 meters

Strap Hand-stitched alligator leather with prong buckle in 750/000 gold

Limited Edition One of 10


Colour and Finishing Goldstone


Hands Handmade, Gold


Strap Hand-stitched alligator leather

Buckle Prong buckle in 750/000 gold


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