Exploring Oster’s Collaborations with Independent Watchmakers, Armin Strom, Moritz Grossmann & Schwarz Etienne

By Oster Jewelers | March 31, 2025 0 Comments

With over three decades of watch expertise, Jeremy Oster has transformed his passion for horology into captivating collaborations with some of the world’s most esteemed independent watchmakers. These partnerships have given rise to a collection of exclusive limited-edition timepieces, each a reflection of Oster’s visionary perspective and discerning eye as both a collector and connoisseur.

Moritz Grossmann DATE Ice Blue Oster Edition

Jeremy Oster’s latest collaboration with Moritz Grossmann introduces a breathtaking Ice Blue rendition of their signature DATE timepiece, limited to just eight exclusive pieces. This refined take on the classic dress watch features a mesmerizing hand-guilloché dial and sub-dial, masterfully crafted by Kari Voutilainen of Comblémine, encased in a sleek 41mm stainless steel design.

At its heart lies the remarkable calibre 100.3 with a jumping date display—an ingenious fusion of precision engineering and everyday practicality. The distinctive bracket-shaped date indicator and full 1-to-31 scale elevate both functionality and elegance, making the DATE Ice Blue Oster Edition a standout creation in fine watchmaking.

Armin Strom Gravity Equal Force Ultimate Oster Blue

With a unique guilloché pattern on the vibrant, sapphire blue base plate, the latest Oster collaboration of the Gravity Equal Force introduces a striking combination exclusively crafted in a series of only 10 pieces. The sapphire blue base plate steals the spotlight with its vintage-inspired Tapestry guilloché pattern, meticulously engraved by Kari Voutilainen using a traditional rose engine lathe. Enhanced by a cutting-edge 3D PVD coating, the rich blue surface reveals a dynamic interplay of tones, shifting beautifully with the light.

At its core, the Gravity Equal Force redefines innovation as the first automatic watch to feature an equal force transmission directly within the mainspring barrel—an Armin Strom exclusive. This breakthrough ensures unwavering precision by delivering consistent energy to the regulating mechanism throughout its power reserve. Completing the dial’s architectural brilliance are a visible power reserve indicator and a micro-rotor with a dual-spring click system, marrying technical mastery with visual elegance.

Schwarz Etienne x Oster Roma Synergy Evergreen

Originally a 16 piece two dial release in celebration of 20 Years of Oster Jewelers, the Oster Roma Synergy again brought the talents of Kari Voutilainen to center stage with its exclusive evergreen dial. The deep textured color draws inspiration from the rich Colorado landscape of fresh pine, in tribute to the home of Oster Jewelers. While the 42mm version has sold out, the 39mm edition is available exclusively thru Oster Jewelers.

Beneath its elegant design lies the Manufacture ASE 200.00 automatic movement, a true rarity. This caliber features a gold-plated micro-rotor, a luxurious touch found exclusively in these models. Unlike a traditional oscillating weight, the micro-rotor is seamlessly integrated, allowing an uninterrupted view of the movement’s artistry. Hand-beveled bridges, adorned with finely straight-grained flanks, offer a breathtaking display of craftsmanship, ensuring the Oster Roma Synergy is as captivating inside as it is on the wrist.

Armin Strom Gravity Equal Force 18KRG Limited Oster Edition

^{Armin Strom Gravity Edge Force Limited Oster Edition (Photo by Jason Pitsch)}

This anniversary collaboration between Armin Strom and Oster Jewelers built on the success of the first GEF Oster Edition. Like the previous and sequential releases, Jeremy again teamed up with master guilloché Kari Voutilainen when bringing this timepiece to life. The exquisite hand-guilloché dial work drew inspiration from a vintage watch Jeremy used to wear with an incredible tapestry pattern. Drawing inspiration from iconic tapestry dials of the 1950s, Kari Voutilainen reimagined this classic motif with a bold, contemporary twist. He experimented with various cut sizes, each revealing a unique interplay of texture and light. The final design—a masterpiece of modern refinement—brings the dial to life with an almost sculptural vibrancy, elevating it far beyond initial expectations.

^{Armin Strom Gravity Edge Force Limited Oster Edition (Photo by Xavier Markl)}

The vision behind this creation was anything but conventional. Rather than taking a “safe” approach with a predictable design meant to appeal broadly, the team sought to craft something extraordinary—an evolution of Armin Strom’s Gravity Equal Force. This new iteration honors Claude Greisler’s groundbreaking technical ingenuity while showcasing the breathtaking artistry of Kari Voutilainen and his Comblémine atelier. The result doesn’t just tell time but redefines the boundaries of technical and artistic watchmaking. The two-fold release of 10 pieces each were originally available in a rich brown edition in a stainless steel case, and the incredible blue dial with an 18k rose gold case.

Learn more about these unique watches at Oster Jewelers.