Small and square: NOMOS adds two new Tetra 27 models
NOMOS Glashütte has added a plain white and a two-tone version to its smallest square watch. Both are hand-wound and only 27.5 mm per side.
The fashion for smaller watches has mostly been a story about round cases getting smaller. NOMOS Glashütte has gone a different way and added two models to the Tetra 27, the smallest square watch it makes.
Two dials, one case
Both new watches use the same steel case, 27.5 mm on each side and 6.1 mm thick. It has a narrow polished bezel and the stepped double lugs that give the Tetra a hint of Art Deco. Water resistance is 50 metres, and you can choose a solid steel back or a sapphire one.
The Tetra 27 white (ref. 402) is the classic version: a white silver-plated dial, temperature-blued hands and a small seconds register. The Tetra 27 duo (ref. 410) leaves out the seconds. It shows hours and minutes only, on a white dial with a pale grey square in the middle and a grey frame around the minute track, so the dial repeats the shape of the case.
The movement
Both watches are hand-wound and use NOMOS's own DUW 4001 calibre, in a "duo" version for the two-hand model. The movement has the NOMOS swing system, the brand's in-house escapement with its blued hairspring, and runs for about 53 hours on a full wind. With the sapphire back you can see Glashütte ribbing and blued screws.
Both come on a black Horween Shell Cordovan strap. They are part of the permanent collection, not limited editions. In Europe the range starts at EUR 1,660 for the duo with a steel back and goes up to EUR 2,120 for the white with a sapphire back.
Why it matters
A hand-wound watch this small leaves very little room inside. It's the kind of watch a watchmaker opens with care, because every part is packed in tightly. NOMOS's point is that a small watch doesn't have to be a lesser one: these use the same in-house movement family as its larger models.
Gallery
Tetra 27 duo: the grey square echoes the case. Photo: NOMOS Glashütte · press image · NOMOS Glashütte press
Sapphire back with the hand-wound DUW 4001. Photo: NOMOS Glashütte · press image · NOMOS Glashütte press
Specifications
| Reference / edition | |
|---|---|
| Reference | 402 (Tetra 27 white), 410 (Tetra 27 duo) |
| Edition | Permanent collection |
| Case | |
| Material | Stainless steel, two-part; stainless steel back (sapphire back optional) |
| Size | 27.5 × 27.5 mm |
| Thickness | 6.1 mm |
| Water resistance | Up to 5 atm (splash-proof) |
| Crystal | Sapphire |
| Dial | |
| Tetra 27 white | Galvanised, white silver-plated; small seconds |
| Tetra 27 duo | Galvanised, white and grey silver-plated; hours and minutes |
| Hands | Steel, tempered blue |
| Movement | |
| Calibre | DUW 4001 (white) / DUW 4001 Duo (duo), in-house |
| Type | Manual winding |
| Diameter / height | 10½ lines (23.3 mm) / 2.6 mm |
| Jewels | 17 |
| Power reserve | Up to 53 hours |
| Details | NOMOS swing system, blue balance spring, Glashütte stopwork, three-quarter plate, adjusted in six positions; stop-seconds on the white |
| Strap | |
| Strap | Horween Genuine Shell Cordovan, black; lug width 18 mm |
Specifications per brand: NOMOS Glashütte data sheets (July 2026).
Sources
- NOMOS Glashütte press release: Outstanding mechanics in miniature
- Monochrome: Nomos Adds Two New Compact Tetra 27 to the Collection
- Deployant: NOMOS Glashütte Tetra 27 white and Tetra 27 duo
- Worn & Wound: Nomos Introduces New Tetra 27 References