Armin Strom Gravity Equal Force Ultimate Sapphire ST21-GEF.SA Unworn/New Condition 2024

Armin Strom Gravity Equal Force Ultimate Sapphire ST21-GEF.SA Unworn/New Condition 2024 Limited 25

Limited Edition 25 pieces.

The watch will be delivered with the original box, papers, and almost 4 years international factory warranty. Warranty card date: 4-2024. The watch is in Unworn/New Condition.

The Armin Strom ST21-GEF.SA is a groundbreaking timepiece that blends technical mastery with minimalist elegance. As part of the acclaimed System 78 collection, it features the world’s first automatic watch with a constant-force mechanism—ensuring consistent power delivery and exceptional accuracy over time.

Crafted in polished stainless steel with a 41 mm case, this watch showcases an openworked movement beneath a grey sapphire dial, allowing a full view of the mechanical artistry. The hand-decorated movement, created in collaboration with Kari Voutilainen, includes a rhodium-plated micro-rotor and ruthenium-coated bridges, reflecting Armin Strom’s commitment to haute horlogerie craftsmanship.

Key Features:
In-house caliber ASB19 with ~72-hour power reserve

Constant-force transmission for precision timekeeping

Transparent sapphire dial with off-center hours and minutes

Exhibition caseback and front sapphire crystals

Black fabric strap with stainless steel buckle or deployant clasp

The Gravity Equal Force Ultimate Sapphire is more than a timekeeper—it’s a modern mechanical sculpture for the wrist, built for those who appreciate both innovation and tradition.