A polished stainless steel case, a dial in deep, glossy blue, complemented by beautifully contrasting hour and minute numerals. Tetra neomatik blue has a striking impact with its 33 x 33 millimeter dial and high color intensity. The richly embellished NOMOS DUW 3001 caliber ticks with efficient neomatik technology. The three-quarter plates, ribbing and tempered blue screws can be seen through the sapphire crystal back—the famous hallmarks of Glashütte’s 175 years of watchmaking. The limited engraving on the case back indicates the exclusivity of this watch.
Impression
Not in the least mainstream. Limited to 175 pieces each, the Tetra watches are bolder than wearing sneakers with a suit jacket.
Specifications
- Ref.
- 421.S3
- Case
-
stainless steel, bipartite
sapphire crystal glass back
- Glass
- domed sapphire crystal glass with anti-reflective coating
- Winding
- automatic
- Dimensions
-
size
33.0 mm
×
33.0 mm
height 7.3 mm
lug-to-lug 45.3 mm
- Water resistance
- 3 atm (splash-proof)
- Dial
- blue
- Hands
- rhodium-plated
- Strap
-
Horween Genuine Shell Cordovan brown, remborde
lug width 20 mm
- Clasp
-
Deployant clasp
- Limited Edition Engraving
- 1/175 blue
Caliber
Unusually slender, highly precise, and equipped with the NOMOS swing system (which ensures outstanding accuracy): the automatic caliber DUW 3001 is setting new standards. And lets automatic watches remain wonderfully elegant.
- Caliber
-
DUW 3001 (adjusted according to chronometer standards)
automatic
- movement height
- 3.2 mm
- diameter
- 12 ¾ lines (28.8 mm)
- Power reserve
- up to 43 hours
- Jewels
- 27
Beautiful things


Outstanding materials
Designed in Berlin, elaborately produced, and polished by hand, the NOMOS winged clasp exudes elegance through its beautiful minimalism.
All things considered: a straightforward watch needs an equally straightforward clasp. The NOMOS deployant clasp, designed in Berlin, is made of highly polished 316L stainless steel and is unobtrusive. The clasp is included at no extra charge with the four models of the Tetra neomatik – 175 Years Watchmaking Glashütte limited edition.

Beautifully presented
A black case, made of fine leather, protects the watch during shipping and also fits easily in your luggage.