New Release: Armin Strom Gravity Equal Force Ultimate Sapphire Purple

Armin Strom’s Gravity Equal Force collection continues to grow with the 2024 launch of the Ultimate Sapphire Purple model.

Armin Strom Gravity Equal Force Ultimate Sapphire Purple


  • The first automatic watch with a patented equal-force transmission integrated into the mainspring barrel, a power reserve indication, and a unique micro-rotor design.
  • Guilloché mainplate crafted by Artist-Watchmaker Kari Voutilainen, renowned for the excellence of his handmade guilloche decoration techniques.
  • Limited to 25 pieces per year.

Armin Strom Gravity Equal Force Ultimate Sapphire Purple

From the press release:

Armin Strom’s System 78 collection represents the independent manufacture’s purest expression of innovative haute horlogerie. Within it, the classical codes of watchmaking are revisited to bring about new functions and solutions, while also expressing the brand’s unique aesthetic sensibilities.

With an emphasis on transparency, as well as highlighting kinetic elements, the Gravity Equal Force stands out as a technical tour-de-force with an instantly recognizable look – outstanding in form and function, finished by meticulous hand decoration.

Now, with the new ‘Purple’ Ultimate Sapphire Edition, Armin Strom is doubling down on integrating vibrant chromatic hues with exceptional mechanics.

Armin Strom Gravity Equal Force Ultimate Sapphire Purple

Let it reign: Gravity Equal Force Purple

At once regal and electric, the latest edition of the Gravity Equal Force features a color Armin Strom has never used before.

Its base plate boasts a guilloché engraved motif with a barley grain pattern, expertly handcrafted in the atelier of acclaimed independent watchmaker Kari Voutilainen using a traditional rose engine lathe.

Armin Strom Gravity Equal Force Ultimate Sapphire Purple

The striking purple color is applied using a 3D PVD process, which reflects a wide spectrum of tones as it shifts with the light.

Making this edition even more outstanding, the small off-center dial is crafted from transparent sapphire crystal, which is reserved exclusively for the Gravity Equal Force’s Ultimate Sapphire Editions.

The crowning glory is a light grey nubuck leather strap with purple stitching and keepers. The Gravity Equal Force Ultimate Sapphire Purple is limited to a run of 25 pieces per year.

Armin Strom Gravity Equal Force Ultimate Sapphire Purple

Automatic: redefined

The Gravity Equal Force stands out as the first automatic watch endowed with an equal force transmission integrated directly in the mainspring barrel – a patented mechanism by Armin Strom. It provides consistent power transmission to the regulating organ, ensuring unwavering precision throughout the watch’s autonomy.

Armin Strom Gravity Equal Force Ultimate Sapphire Purple

The power reserve indicator forms part of the barrel, which is entirely visible from the dial side, opposite the micro-rotor with a unique click system featuring two springs for better winding efficiency.

Also this latest creation, part of Armin Strom’s perpetual quest for superior chronometric performance, was entirely developed, manufactured and decorated within the walls of the Bienne-based manufacturing site.

Like all Armin Strom watches, the Gravity Equal Force Purple’s movement is assembled a first time to ensure it is in perfect working order and that it meets the brand’s exacting decorative standards, then taken apart and assembled a second time when it is ready to be cased in its final form.

Putting the ‘haute’ in ‘horlogerie’

What separates a mere tool from a work of art is craftsmanship. Like a canvas for artistic expression, superlative hand-finishing applied by specialized watchmakers and seasoned artisans can be appreciated throughout the Gravity Equal Force and its many proudly exposed layers and components.

Back of the Armin Strom Gravity Equal Force

Polished bevels (anglage) on the bridges, black polished screws, polished countersinks, perlage and various types of graining, be it straight or circular, as well as Geneva stripes on the three-quarter bridge visible through the case’s back.

One of the Gravity Equal Force’s most distinctive elements is the triplet of dark grey ruthenium-plated bridges that occupy the right-hand portion of the open display. Inspired by the finger-style bridges found in pocket watches, it takes up to an entire day for these bridges to be embellished by hand.

Armin Strom Gravity Equal Force Ultimate Sapphire Purple

First, the undersides are given a matt finish, after which the sides are given a straight-graining finish by carefully sliding them on an abrasive paper to produce continuous, shimmering fine lines.

Then, the inner and outer chamfers of the bridges are beveled with increasingly fine files and then finished with a flash polish using locally sourced gentian wood to remove even the finest lines. Finally, a straight-graining finish is applied to the top side for ultimate radiance.

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Quick facts: Armin Strom Gravity Equal Force Ultimate Sapphire Purple
Hours, minutes, seconds, power reserve indicator

Dial: Grey toned off-center sapphire dial with subdial
Hands: Faceted polished hands and Super-LumiNova® filling
Movement: Armin Strom manufacture Caliber ASB19, automatic winding with micro rotor, Geneva-drive equal force barrel, offset display with subdial seconds
Main plate: purple PVD plate with guilloché pattern by Kari Voutilainen
Regulating system: Balance wheel with 4 regulating screws
Power reserve: Geneva stop-work limited to 72 hours
Frequency: 3,5 Hz (25,200 vph)
Finishing: Hand-finishing to the highest quality level
Jewels: 28
Number of components: 202
Stainless steel, sapphire crystal and case back with anti-reflective treatment

Dimensions: 41 mm diameter x 12.65 mm height
Water resistance: 30 meters
Strap: Delivered with a grey nubuck leather strap with purple stitching and keepers
Buckle: Pin buckle or folding clasp available in stainless steel, width lugs/buckle: 20/18 mm
Price: CHF 27.500 / EUR 31.900 / GBP 27.300 / USD 28.900

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