With its off-center grey-toned sapphire dial, the strikingly cool monochrome watch offers an extraordinary view of the exquisitely-finished manufacture movement and further enhances the brand’s reputation for its irrepressible, exuberant independence

Armin Strom’s Gravity Equal Force has made quite an impression on watch enthusiasts since it was first launched in 2019. And for good reason: it is the world’s first automatic watch with constant force transmission, which results in consistent power delivery to the balance. In short, it means that the watch always delivers flawlessly constant precision. Its ASB19 caliber offers a power reserve of 72 hours.

The timepiece stands out not only with its groundbreaking technology but by a design and craftsmanship that set it apart from every other watch. With the launch of the Gravity Equal Force Ultimate Sapphire, Armin Strom has reinforced its commitment to the transparent mechanics that have been generating an industry-wide buzz since the brand’s beginnings. The watch is distinguished in equal part by its technical and aesthetic innovations:

The off-center grey-toned sapphire dial offers an unobstructed view of the fascinating mechanics inside the case and emphasizes the brand’s passion for transparent mechanics, which are at the core of its design philosophy. The bridges are coated with dark grey ruthenium; the barrel and the micro rotor are coated with rhodium.

Presented in a classic 41 mm stainless-steel case, the Armin Strom Gravity Equal Force Ultimate Sapphire comes with a black fabric strap with light grey stitching, subtly maintaining the watch’s resolutely cool monochrome color scheme. The new watch’s cool, understated monochrome design will appeal to fans of the brand’s design philosophy:
“We’ve re-imagined the Gravity Equal Force to more fully embrace our passion for transparent mechanics, while adding complementary aesthetic complexity that enhances the watch’s special visual impact”, points out Claude Greisler, Armin Strom’s co-founder and head watchmaker.

“The special version of our GEF was extremely well received in early presentations to collectors so we hope to be able to produce 30 more watches next year in addition to the 15 from this year. That may, however, be too ambitious because our capacities are limited and it always has to be a rare piece, which is why we have decided that half of all future productions will be placed on a first-come/first-served waiting list for those who inquire via our website”, adds Serge Michel, founder of Armin Strom.
Exquisite in-house design and production
This breathtaking new Gravity Equal Force timepiece was designed and produced in-house at the brand’s manufacture in Biel. Like every Armin Strom watch, its movement has been assembled twice. After its first assembly, the movement was painstakingly disassembled and each individual part was cleaned, dried, reassembled and lubricated before being meticulously regulated, tested, and returned to the case.

Redefining the horological landscape
Launched in 2019, the milestone timepiece demonstrates Armin Strom’s core principle: to bring innovation to every watch. It combines the brand’s celebrated passion for transparent mechanics and its distinctive design as well as its commitment to redefining the horological landscape with every new product.

The Gravity Equal Force Ultimate Sapphire will be available from October 2021 in a limited quantity of 15 pieces for 2021. Due to the limited production capacity, the special timepiece will be available subsequently in a very small number of pieces per year.
Armin Strom Gravity Equal Force Ultimate Sapphire
Reference: ST21-GEF.SA.VE.M.30
Indications: Hours, minutes, seconds, power reserve indicator
Movement: Armin Strom manufacture Caliber ASB19, Automatic winding with micro rotor, Geneva-drive equal force barrel, offset display with subdial seconds; Regulating system: Balance wheel with 4 regulating screws; Power reserve: Geneva stop-work limited to 72 hours; Dimensions: 35.52 mm x 11.67 mm; Frequency: 3,5 Hz (25,200 vph); Finishing: Hand-finishing to the highest quality level; Jewels: 28; Number of components: 202
Case: Stainless steel; Sapphire crystal and case back with anti-reflective treatment; Diameter: 41 mm; Height: 12,65 mm; Water resistance: 3ATM
Dial: Grey toned off-center sapphire dial with subdial
Hands: Manufactured by Armin Strom, steel with hand finishing and Super-LumiNova® filling
Strap: Delivered with a black fabric strap with light grey stitching and stainless-steel double folding clasp
Price: 20,000 EUR


