New from NOMOS Glashütte: duo. These elegant, two-hand models are 33 millimeters in diameter—or for Tetra 27 duo, with a side length of 27 millimeters. Perfect for more slender wrists and still highly precise, even without the small seconds. The NOMOS caliber Alpha.2 sets the pace inside.
Prizes and awards
The prizes have been stacking up—Tetra wins you over with style, charm, and substance. And has done so for a quarter of a century.

Impression
Perfectly proportioned for slender wrists: Tetra duo with a side length of 27 millimeters.
Specifications
- Ref.
- 405
- Case
-
stainless steel, bipartite
stainless steel back
fixed with four screws
- Glass
- sapphire crystal glass
- Winding
- manual
- Dimensions
-
size
27.5 mm
×
27.5 mm
height 6.1 mm
lug-to-lug 38.5 mm
- Water resistance
- 3 atm (splash-proof)
- Dial
- galvanized, white silver-plated
- Hands
- in gold
- Strap
-
Velour leather beige
lug width 18 mm
Caliber
Alpha.2 is based on our highly precise in-house caliber, Alpha. Though with a small—but important— difference: The caliber has a modified second wheel with a smaller staff. Alpha.2 keeps time in our smaller two-hand versions of Tangente, Orion, Ludwig, and Tetra.
- Caliber
-
Alpha.2
manual
- movement height
- 2.6 mm
- diameter
- 10 ½ lines (23.3 mm)
- Power reserve
- up to 43 hours
- Jewels
- 17
Beautiful things

Outstanding materials
This light-colored velour leather strap discreetly lets the watch attract attention: It flatters particularly delicate wrists and lets smaller watches appear even more refined.

Beautifully presented
Our hand-wound timepieces come in the classic NOMOS watch box. It is crafted from black poplar wood—and the perfect place for your favorite watch and its warranty booklet.