Artist-watchmaker Kari Voutilainen cuts the barley-grain guilloché on the mainplate of Armin Strom’s latest Gravity Equal Force, in a purple the brand says it has never used before.
Armin Strom today introduces the Gravity Equal Force Ultimate Sapphire Purple, limited to 25 pieces per year. The purple is applied with a 3D PVD process and shifts in tone with the light.
The small off-centred dial is transparent sapphire crystal, which the brand reserves for its “Ultimate Sapphire Editions”. Three dark grey ruthenium-plated bridges occupy the right of the open display. They are inspired by the finger-style bridges of pocket watches, and finishing them by hand takes up to a full day.
Armin Strom says the Gravity Equal Force was the first automatic watch with an equal force transmission built into the mainspring barrel, a patented mechanism. The barrel, with its power reserve indicator, is visible from the dial side, opposite the micro-rotor.
Like every Armin Strom watch, the movement is assembled once to check it, then taken apart and assembled again when it is ready to be cased.
Armin Strom calls the result “at once regal and electric”.
The Basics
Brand: Armin Strom
Model: Gravity Equal Force Ultimate Sapphire Purple
Reference: AS/ID ST24-GEF.SA.AC.M.A7.FC
Diameter: 41mm
Thickness: 12.65mm
Case material: Stainless steel; sapphire crystal and case back, anti-reflective treatment
Dial: Grey-toned off-centre transparent sapphire dial with subdial; purple PVD mainplate with barley-grain guilloché by Kari Voutilainen; faceted polished hands
Water resistance: 3 ATM
Strap: Grey nubuck leather, purple stitching and keepers; pin buckle or folding clasp in stainless steel; 20/18mm
Limited edition: 25 pieces per year
The Movement
Calibre: Armin Strom manufacture Calibre ASB19
Functions: Hours, minutes, seconds, power reserve indicator
Winding: Automatic, micro-rotor; Geneva-drive equal force barrel
Power reserve: Geneva stop-work limited to 72 hours
Frequency: 3.5Hz (25,200 vph)
Jewels: 28
Images courtesy of Armin Strom.