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Armin Strom / Gravity Equal Force

Armin Strom Gravity Equal Force

Collection profile · 2019

Armin Strom’s Gravity Equal Force is the brand’s System 78 constant-force automatic platform, built around the patented equal-force barrel and Geneva stop-work concept to deliver more consistent torque while preserving the manufacture’s open, mechanics-first architecture.

Why it matters

The Gravity Equal Force translates a typically high-horology constant-force problem into a relatively compact, automatic, serially produced Armin Strom collection. It matters because the watch pairs a patented torque-management solution with modern openworked design and hand-finishing, making it one of the brand’s signature technical propositions beyond one-off complications.

Key references

Armin Strom Gravity Equal Force Ultimate Sapphire front view

ST21-GEF.SA

Gravity Equal Force Ultimate Sapphire — Current steel 41 mm openworked execution with ASB19 calibre, equal-force barrel and limited production of 25 pieces.

Armin Strom

ST24-GEF.BLU

Gravity Equal Force Ultimate Sapphire Blue — Blue-toned variation in the same 41 mm System 78 format with glacial blue guilloché main plate.

ST24-GEF.SAL

Gravity Equal Force Ultimate Sapphire Salmon — Salmon PVD mainplate variant announced in December 2025, continuing the compact openworked GEF format.

Collection timeline

  • 2019 — Armin Strom introduced the Gravity Equal Force as the first automatic watch with an equal-force transmission mechanism integrated in the mainspring barrel.
  • 2024 — The Gravity Equal Force Ultimate Sapphire Purple extended the line with a new sapphire-dial colourway and reaffirmed the collection’s place inside System 78.
  • 2025 — The Gravity Equal Force Ultimate Sapphire Blue added a glacial blue aesthetic while retaining the ASB19 micro-rotor equal-force architecture.
  • 2025 — The Gravity Equal Force Ultimate Sapphire Salmon continued the collection’s annual colour-led expansion with a salmon PVD mainplate.

FAQ

When was the Gravity Equal Force collection introduced?

Armin Strom states that the Gravity Equal Force was first launched in 2019.

What defines the Gravity Equal Force technically?

Its core feature is Armin Strom’s patented equal-force barrel with Geneva stop-work, designed to deliver more consistent power to the regulating organ in an automatic movement.

Official collection ↗

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More from Armin Strom

  • Mirrored Force ResonanceArmin Strom Mirrored Force Resonance First Edition front view — The Mirrored Force Resonance is Armin Strom’s signature resonance wristwatch family, using two independent balances connected by the brand’s patented resonance clutch spring. It is one of the clearest modern expressions of observable resonance on the wrist and a cornerstone of the brand’s contemporary identity.
  • System78 — System78 is Armin Strom's accessible-haute-horlogerie umbrella collection, grouping the brand's wearable in-house pieces under a shared architecture-first philosophy across Gravity Equal Force, Orbit, and One Week families.
  • One WeekArmin Strom One Week First Edition hero image — Armin Strom’s One Week is the System 78 family’s seven-day, manually wound platform: a contemporary, openworked three-hander built around twin barrels, a prominent power-reserve display, and the brand’s accessible-haute-horlogerie positioning within its in-house collection architecture.
  • Tribute — Armin Strom’s Tribute line is the classical flank of the System 78 family, pairing an off-centre time display, visible barrel architecture and hand-finishing with a slimmer, dressier 38 mm format than the brand’s more overtly technical pieces.

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