With an impressive 25 in-house calibers to their name (and counting), Armin Strom have been making incredible use of their completely in-house manufacture since 2009, when they launched their first in-house caliber, the ARM09. Since then, Armin Strom have capitalized on their creative team of engineers, talented watchmakers and a meticulous attention-to-detail to create some of horology’s most technically impressive independent movements. While they might lack the economic power of the larger brands, they make up for it with inventiveness, something the Gravity Equal Force Ultimate Sapphire that we have here is full of. First launched in 2019 as the Equal Force System 78 - the world’s first automatic wristwatch with a stop-work declutch mechanism and Geneva cross inside the barrel, designed to deliver consistent torque and chronometric precision across the entire power reserve, the collection has since grown to include variants such as the Ultimate Sapphire ref. ST21-GEF.SA example that we have here, which debuted in 2021. Boasting a stainless steel 41mm case that is only 12.65mm tall, the ref. ST21-GEF.SA’s construction is a casual and capable package filled with Armin Strom’s design DNA, as represented by its thin bezel and unique angular lugs. Sporting a sapphire subdial for its hours and minutes atop a base plate guilloche engraved with a “grain d’orge” pattern by Kari Voutilainen upon which an array of visible gears and bridges are on display, the resulting aesthetic is distinctive as Armin Strom. Powered by Armin Strom’s in-house automatic cal. ASB19 movement featuring a micro-rotor and a patented stop-work declutch mechanism, which regulates the torque from the mainspring to ensure constant force delivery, the ref. ST21-GEF.SA’s offers impressive accuracy and performance across its 72 hour power reserve.

Watch is in overall like new condition, with only light signs of handling or wear. Comes complete with box, warranty card, booklet and loupe.

An impressive example of the kind of technical and aesthetic craftsmanship that independent watchmakers imbue their creations with, this Gravity Equal Force Ultimate Sapphire is the ultimate exhibition of Armin Strom's capabilities.