Armin Strom kept pushing its technical mastery. And then the Gravity Equal Force series got an elegant, warm twist: the Ultimate Sapphire Salmon.
This isn’t just another colorway. The independent Swiss manufacture is continuing its obsession with transparency and movement visibility, but here they’ve married it to serious artisanal finesse. The new edition centers on a stunning, hand-guilloché salmon mainplate. Let’s be real, the vibrancy this brings to one of modern horology’s most inventive movements—the constant-force Calibre ASB19—is the whole point.
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The Mechanism: Constant Force, Visible Intelligence
The Gravity Equal Force (GEF), introduced in 2019 as part of the accessible System 78 collection, marked a major technical shift.
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The Innovation: The in-house Calibre ASB19 was the world’s first automatic watch to integrate a stop-work declutch mechanism right into the mainspring barrel. That happened.
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The Result: The system only uses the most consistent part of the mainspring’s power curve. That ensures constant torque and stable accuracy (isochronism) is delivered to the escapement throughout its 72-hour power reserve. They are breaking the traditional law of a dropping force curve.
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The View: The watch is designed so you can see the action. The architecture unfolds like a mechanical landscape: the micro-rotor sits at one o’clock, the equal-force barrel at five, all connected by pocket-watch-inspired finger bridges.
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Artistry and Aesthetics
The Ultimate Sapphire Salmon retains the familiar, wearable 41mm stainless steel case with the signature lip at 6 o’clock. But the color is the draw here.
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The Salmon Element: The watch gets its name from the salmon-coloured PVD mainplate. This plate features a delicate barley grain (or grain d’orge) pattern, which was hand-guilloché by the famous master artisan Kari Voutilainen’s Comblémine atelier. Voutilainen is known for this ultra-traditional, mesmerizing, engine-turned work.
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The Architecture: The grey-toned sapphire sub-dial for time floats above this guilloché salmon base, creating a visual depth that showcases the movement’s complexity.
Every piece is a commitment to haute horlogerie. The Calibre ASB19 is assembled and hand-finished twice—with polished bevels, Geneva stripes, and black-polished screws—in the Biel manufacture. It’s about the attention to every microscopic detail.
This latest edition, reference ST24-GEF.SAL, is limited to just 25 pieces per year and is priced at CHF 27,500. It’s an ongoing effort to merge traditional finesse with radical micro-engineering.
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