ARMIN STROM – SYSTEM 78 Gravity Equal Force Ultimate Sapphire Blue Edition 2025
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With the Gravity Equal Force Ultimate Sapphire Blue, we bring the
best of Switzerland to your wrist: Timekeeping, Precision and
Breathtaking Landscapes
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A new interpretation of Armin Strom’s signature timepiece, the Gravity Equal Force Ultimate Sapphire Blue, joins the System 78 collection with a cooler, glacial-toned aesthetic.
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This new edition highlights the transparency and depth of the collection’s distinctive architecture while introducing a refined palette of silvery greys and soft blue tones, evoking the tranquil clarity of Switzerland’s glacial lakes and alpine light.
A study of landscape and architecture
Housed in a 41 mm stainless steel case, the Gravity Equal Force Ultimate Sapphire Blue retains the defining features of the model, reimagined through a new chromatic lens.
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At its centre lies a richly textured, glacial blue guilloché main plate crafted by independent watchmaker Kari Voutilainen. The open dial — positioned asymmetrically on the left side—is made of transparent sapphire, revealing the silvery components below.
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The cooler colour palette continues throughout the movement, with the micro-rotor, equal-force barrel and finger bridges hand finished in rhodium to match the gear-train.
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These tones contrast cleanly with the transparent sapphire dial, while the blue nubuck leather strap ties the whole look together with a modern, streamlined finish.
Controlling torque with delivery on time
The watch is powered by Armin Strom’s proprietary Caliber ASB19, the first automatic movement to feature a stop-work declutch mechanism combined with a Geneva cross within the barrel.
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This patented system ensures that the force delivered to the balance remains constant throughout the 72-hour power reserve, greatly improving isochronism.
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The movement’s compact micro-rotor allows it to be wound efficiently while preserving a thin and elegant profile.
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Visible through the front and back sapphire crystals, the movement showcases a thoughtful integration of engineering and aesthetics—delivering consistent precision in a visually open design.
A Commitment to Hand-Finishing
Every component of the ASB19 is hand-finished in Armin Strom’s manufacture in Biel.
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The bridges are bevelled and polished by hand; screws are black polished. Traditional decoration techniques—such as perlage, Geneva stripes and circular graining — are applied with care, underscoring the brand’s belief that hand-finishing is integral to its identity.
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As with all Armin Strom creations, the Gravity Equal Force Ultimate Sapphire Blue is assembled twice. This dual-build process ensures both technical reliability and aesthetic refinement, reinforcing the brand’s uncompromising standards of craftsmanship.
Limited Annual Production
The Gravity Equal Force Ultimate Sapphire Blue is produced in a limited annual series of 25 pieces and is priced at CHF 27’500.
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It is part of Armin Strom’s System 78 Collection, a line dedicated to showcasing independent watchmaking through technical innovation, architectural design, and a commitment to traditional hand-finishing.
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The collection pays tribute to the birth year of co-founders Claude Greisler and Serge Michel, and to the values that continue to define the brand today.
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TECHNICAL CHARACTERISTICS
Collection: SYSTEM 78
Model: Armin Strom Gravity Equal Force Ultimate Sapphire Blue
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Reference: ST24-GEF.BLU
Limited production of 25 pieces per annum
CaseMaterial: Stainless steel
Sapphire crystal and case back with anti-reflective treatment
Diameter: 41 mm
Height: 12.65 mm
Lug-to-Lug: 48.09 mm
Water-resistant to 3 ATM
Dial and hands
Dial: Grey toned off-center sapphire crystal with subdial
Hands: Rhodium, facetted and polished with Super-LumiNova® filling
Movement
Armin Strom Manufacture Caliber ASB19
Winding mechanism: Automatic-winding with micro rotor
Functions: Patented equal force barrel, offset display with subdial seconds
Regulating system: Balance wheel with 4 regulating screws
Main plate: Glacial blue PVD plate with guilloché pattern by Kari Voutilainen
Dimensions: 35.52 mm x 11.67 mm
Frequency: 3.5 Hz (25,200 vibrations per hour)
Number of jewels: 28
Number of parts: 202
Power reserve: Geneva stop-work limited to 72 hours
Functions/Indications
Hours, minutes, seconds, power reserve indicator
Strap and buckle
Blue nubuck leather strap with ice blue stitching and keepers
Stainless steel folding clasp
🔰EDITION Limited edition to 25 pieces
🔴Price: CHF 27,400 / EUR 25.900 / GBP 27.300 / USD 26.900💰
(Price excluding tax / Free global delivery) 💰
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Press releases - 2025
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ARMIN STROM AG |
Bözingenstrasse 46
CH-2502 Biel-Bienne | Switzerland
Tel. +41 (0)32 343 33 44
Fax +41 (0) 32 343 33 40
info@arminstrom.com
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For more information relating to this press release or to Armin Strom:
Bettina Fleury, Armin Strom AG,
Tel. +41 32 343 33 44, b.fleury@arminstrom.com
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