Armin Strom Introduces the Minute Repeater Resonance 12:59 First Edition
A new architecture built around sound and synchronization
With the Minute Repeater Resonance 12:59 First Edition, Armin Strom presented one of its most complex constructions to date at Watches and Wonders 2026. The novelty combines two demanding principles of watchmaking — minute repeater and resonance — in a completely newly developed architecture and expands the concept with additional functions.
Minute repeater with Expanded Sound Spectrum
At the center is a newly designed striking mechanism, which has been expanded compared to classic minute repeaters. Instead of the usual two hammers and gongs, the watch operates with four hammers and four gongs, producing a complete Westminster melody. This construction allows for more nuanced acoustic playback but simultaneously imposes higher demands on the coordination of all components. Integrating it into a comparatively flat movement, in particular, requires precise control of energy flow and mechanics. The visible centrifugal governor on the dial side controls the striking sequence and ensures a uniform playback speed. At the same time, it functions as a dynamic element within the open design.
Limited to 25 pieces: Armin Strom Minute Repeater Resonance 12:59 First Edition
Armin Strom
Two Striking Modes: Classic Repetition and 12:59 Function
A key innovation is the integration of two different striking modes. In standard mode, the watch chimes the currently displayed time. Additionally, a so-called “12:59 Anytime” sequence can be triggered. This represents the longest possible striking sequence of the mechanism — consisting of 12 hours, three quarter hours, and 14 minutes. The switch between both modes is done via a column wheel, ensuring precise and reliable function changes. The chosen setting is visualized through a discreet display (white/red), while the chime is activated via a slider at 9 o’clock.
Resonance System with Two Regulation Organs
Parallel to the chiming mechanism, the new manufacture caliber ARR25 operates with a resonance system that includes two fully independent regulating systems. Each of these systems has its own mainspring barrel, gear train, escapement, and balance wheel. Through a patented resonance coupling, both units are synchronized to oscillate in stable interaction with each other. The combination of resonance and minute repetition presents a particular design challenge, as both systems have different energy and stability requirements. The goal is to maintain the synchronization of the balance wheels even during activation of the chiming mechanism.
The front side of the manufacture caliber ARR25 with hammers and centrifugal governor at 12 o'clock
Armin Strom
Caliber ARR25: Design and Performance
The manual-winding caliber ARR25 consists of 506 components and operates at a frequency of 3.5 hertz (25,200 semi-oscillations per hour). The power reserve is approximately 40 hours. With a construction height of 6.53 millimeters, the movement remains relatively flat, especially considering the integrated functions. The resonance coupling has been repositioned compared to previous models and brought more toward the center of the visual composition.
Armin Strom: Rear view of the caliber ARR25. Above, you can see the mechanism, below the two mainspring barrels.
Armin Strom
Design and Case
The case is made of titanium and measures 42 mm in diameter with a height of 11.7 mm. The design follows the open architecture typical of Armin Strom. On the dial side, the central elements are visibly arranged: resonance system, hammers, gongs, and centrifugal governor. Despite this complexity, the display of hours and minutes remains centered and classic in design. The titanium dial is anthracite-colored and serves as a calm background for the mechanical components. The lines are kept soft and flowing to visually structure the multitude of elements.
The minute repeater is triggered with the slider on the case edge.
Armin Strom
Finishing
As is usual with Armin Strom, every component is hand-finished. Polished and matte surfaces alternate, creating contrasts between the individual components. Hammers, gongs, and the resonance coupling are mirror-polished, while the base plate and bridges are predominantly matte. On the back, classic finishing techniques such as Geneva stripes, circular graining, and straight graining complement the overall appearance.
Limitation and Price
The Minute Repeater Resonance 12:59 First Edition is limited to 25 pieces and is worn on a matte alligator leather strap with a titanium pin buckle. The price is $499,000.
To learn more, visit Armin Strom, here.
