Inspired by the purity of Swiss landscapes, the Gravity Equal Force Ultimate Sapphire Blue embodies technical excellence and timeless design.
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. 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.
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. 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. 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. 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.
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. This patented system ensures that the force delivered to the balance remains constant throughout the 72-hour power reserve, greatly improving isochronism. The movement’s compact micro-rotor allows it to be wound efficiently while preserving a thin and elegant profile. 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.
Every component of the ASB19 is hand-finished in Armin Strom’s manufacture in Biel. 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. 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.
The Gravity Equal Force Ultimate Sapphire Blue is produced in a limited annual series of 25 pieces.
Patented equal force barrel
Geneva stop-work
Glacial blue PVD plate with guilloché pattern by Kari Voutilainen
Stainless steel
Sapphire crystal and case back with anti-reflective treatment
Water resistance: 3 ATM
Diameter: 41 mm
Height: 12.65 mm
Lug-to-Lug: 48.09 mm
Grey toned off-center sapphire crystal with subdial
Rhodium, facetted and polished with Super-LumiNova® filling
Blue nubuck leather strap with ice blue stitching and keepers
Stainless steel folding clasp
