A haute horlogerie tribute to tranquil alpine lakes

Inspired by the crisp blue waters and tranquility of Northern California’s stunning mountain lakes, the Armin Strom Gravity Equal Force "Tranquility” Topper Edition features a ‘grain d’orge’ guilloché backplate executed by Kari Voutilainen that simulates the subtle waves of a lake’s surface in the early morning. Its fumé dial, darker in the center and becoming progressively lighter towards the edges, is reminiscent of the changing depths of these lakes whose vibrant blue tones spring to life on a sunny day.

This Topper Edition is powered by Armin Strom's signature Gravity Equal Force calibre — the world’s first automatic watch innovation with constant force transmission. The result is consistent power delivery to the balance which ensures that the watch always delivers flawlessly constant precision.

A key innovation, exclusive to Armin Strom's System 78 collection watches, is the very first implementation of a “stop-work” de-clutch mechanism to be deployed in combination with an automatic movement. Typically seen only in haute-horology timepieces that are orders of magnitude more expensive, a “stop work” mechanism offers the benefit of more consistent energy transmission. To fully understand the benefit of this mechanism, one must first understand why an ordinary watch will not run at a consistent rate throughout the duration of its power reserve. The problem begins with the mainspring that inhabits every mechanical timepiece. A mainspring is a tightly coiled metal ribbon that resides inside of a watch’s barrel to deliver force to the movement. However, the force that a mainspring will deliver in an ordinary watch as it unwinds can never be delivered consistently, because the force provided will necessarily be higher when fully wound than it will be towards the end of its power reserve. To address this, Armin Strom implemented a “stop work” mechanism in the Gravity Equal Force that limits the mainspring from fully unwinding and thereby leverages only that part of the mainspring’s unwinding process which can deliver power most consistently.

This Topper Edition is individually numbered and limited to 15 pieces.

Specifications

• Case: 41mm Stainless steel (12.6mm thick, 48mm lug-to-lug)
• Sapphire crystal and case back with anti-reflective treatment
• Water-resistance: 30m
• Movement distinction: Stop-Work declutch mechanism and Equal Force Barrel
• Winding-mechanism: Automatic with micro rotor turning on dial side
• Frequency: 25.200 vph / 3,5 Hz
• Power reserve: 72 hours
• Dial: Blue gradient in lacquer, 9H Offset with running seconds subdial
• Hands: Steel with hand finishing and Super-LumiNova® filling
• Strap: Blue suede with tonal stitching & stainless steel pin buckle
• Width lugs/buckle: 20/18 mm
• Limited Edition: 15 pieces