Armin Strom Gravity Equal Force Ultimate Sapphire Salmon Brings A New Pulse of Colour

Armin Strom’s celebrated Gravity Equal Force series expands with an elegant twist, the Ultimate Sapphire Salmon. Continuing the brand’s exploration of colour and transparency, this latest edition pairs technical mastery with artisanal finesse, featuring a hand-guilloché salmon mainplate and the brand’s innovative constant-force calibre, bringing new vibrancy to one of modern horology’s most inventive movements.

Independent Swiss manufacture Armin Strom builds its creations so that every component of a fine timepiece is seen, understood, and admired. Founded in 1967 and revitalised in 2009 by Serge Michel and master watchmaker Claude Greisler, the Biel/Bienne-based brand merges traditional hand-finishing with innovative technical ideas. Its System 78 collection, named for the partners’ shared birth year, represents the brand´s drive for uncompromising innovation made accessible to collectors of independent horology.

The Gravity Equal Force (GEF), first introduced in 2019, marked a point in modern watchmaking. It was the world’s first automatic watch with a stop-work declutch mechanism integrated into the mainspring barrel, an innovation that ensures consistent torque and stable accuracy throughout the power reserve. Beyond its mechanical intelligence, the GEF also introduced an unmistakable aesthetic language: an off-centred sapphire sub-dial revealing the movement’s key components, barrel, gear train, micro-rotor, arranged with pocket-watch-inspired finger bridges.

Since its debut, the GEF has evolved through numerous limited editions that highlight colour, craftsmanship, and collaboration. Our third Montre de Souscription, the MONOCHROME x Armin Strom Gravity Equal Force Maillechort, emphasised traditional German silver tones; the Ultimate Sapphire Blue, Purple, and Rose Gold editions brought vibrant new palettes, each hand-guilloché by Kari Voutilainen’s Comblémine atelier. Now, the new Gravity Equal Force Ultimate Sapphire Salmon adds a warm, luxurious note to this ongoing series.

The Gravity Equal Force Ultimate Sapphire Salmon retains the familiar 41mm stainless steel case, measuring 12.65mm in height, and the brand’s signature lip at 6 o’clock. Alternating polished and brushed finishes highlight its lines, while anti-reflective sapphire crystals on both sides reveal the calibre in full. The salmon-coloured PVD mainplate with hand-guilloché in a delicate barley grain pattern by Kari Voutilainen provides this new model its name.

The watch’s architecture unfolds like a mechanical landscape: the micro-rotor at one o’clock, the equal-force barrel at five, and the gear train connecting them. On the grey-toned sapphire time dial (with a small seconds integrated), the rhodium-plated hands with Super-LumiNova filling ensure clear legibility.

The mechanism we see front and back is the Armin Strom Calibre ASB19, an in-house automatic movement built around the patented Equal Force Barrel. By using a Geneva stop-work system and a declutch mechanism inside the barrel, the ASB19 delivers constant force to the escapement, maintaining amplitude stability and improving isochronism over its 72-hour power reserve.

The movement beats at 25,200 vibrations/hour and features a screwed balance with four regulating screws for precision adjustment. As with every Armin Strom calibre, each component is hand-finished and assembled twice in the brand’s Biel manufacture. Finishing details include polished bevels, Geneva stripes, perlage, and black-polished screws, all executed to haute horlogerie standards.

The Gravity Equal Force Ultimate Sapphire Salmon is worn on a grey nubuck leather strap featuring matching stitching, closed with a stainless steel folding clasp. Limited to 25 pieces per year, the watch is priced at CHF 27,500.

For more information, please visit ArminStrom.com.