The Armin Strom Mirrored Force Resonance Ruby is a rare expression of haute horlogerie, uniting natural gemstone artistry with cutting-edge mechanical innovation. Limited to just five pieces, this 43mm stainless steel timepiece features a dial crafted from genuine ruby, each stone selected for its depth of color and organic character. Subtle inclusions and tonal variations ensure that no two dials are alike, reinforcing the individuality prized by collectors of independent Swiss watchmaking. Set against crisp white Roman numerals and paired with a grey Alcantara strap, the vivid mineral surface creates a striking contrast to the architectural symmetry of the openworked resonance movement beneath.

Ref. ST23-RF.10

At its core is the in-house manual-winding Calibre ARF21, engineered and manufactured in Biel and equipped with a patented Resonance Clutch that synchronizes dual balance wheels for enhanced chronometric stability. Beating at 3.5 Hz with a 48-hour power reserve, the movement showcases twin regulating organs, a dual seconds reset pusher, and meticulous hand-finishing including polished bevels, black-polished screws, perlage, and Geneva stripes. The interplay between natural ruby and precision-engineered mechanics transforms this luxury resonance watch into a dynamic three-dimensional display of craftsmanship, innovation, and rare artisanal watchmaking.

TECHICAL SPECIFICATIONS
Calibre
ARF21
Functions
Hours, minutes, twin-seconds
Impulse
Two independent movements
Winding mechanism
Manual-winding
Regulating system
Two independent regulation systems connected by a resonance clutch spring
Frequency
25'200 vph / 3.5 Hz
Jewels
39
Nb of Components
276
Dimensions
- 37.20 diameter
- 6.70 height
Power reserve
48 hour
Distinctions
- Resonance
- Flyback
- Two independent regulating systems connected by a resonance clutch
- Ruby, off-center azuré dial
- Printed Roman numerals
Case
- Stainless steel
-  Sapphire crystal and case back with anti-reflective coating
Diameter
43 mm 
Height
11.55 mm
Lug-to-lug
49.60 mm
Water-resistance
3 atm / 30 meters
Dial
- Ruby off-center azuré dial
- Printed Roman numerals
Hands
Polished rhodium
Strap
- Dark gray Alcantara strap with white stitching and pin buckle in stainless steel

Visit us in Cherry Creek North to personally design your own Armin Strom Mirrored Force Resonance Watch with the Armin Strom Configurator. 

The Armin Strom watch configurator allows you to personalize your timepiece, right down to single parts, such as bridges and plates, in a wide variety of colors.

Use your imagination! Choose from different possibilities to create your own exclusive wristwatch. One that reflects your personality and your own, personal style.

Oster Jewelers is Your Authorized Armin Strom Retail Partner