Illustration. The seconds hand sweeps, like the real movement.
Tetra
Ref. 406
29.5 × 29.5 mm square case, white silver-plated dial, tempered blue hands, sapphire back, black shell cordovan
- Diameter
- 29.5 mm
- Thickness
- 6.5 mm
- Water
- 50 m
- Movement
- DUW 4001
€2,260
Nomos's German web-store price for ref. 406 (sapphire crystal back).
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Why it's interesting
A small, perfectly square watch with Tangente-style numerals and tempered blue hands, only 6.5 mm thick. Square cases are rare outside jewellery brands, and Tetra shows how well one can work when the proportions are this exact.
Watch DNA. Filled tags are editorial; outlined tags come from the specifications.
The numbers
Verified specificationsSize
- Diameter
- 29.5mm
- Lug to lug
- 40.5mm
- Thickness
- 6.5mm
- Lug width
- 18mm
Because you like this…
Chosen for shape, size, colour, character and price. Rarely the same brand twice.
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About this page
Verified specifications, checked September 2026
Dimensions, water resistance, movement and crystal were checked against the sources below.
All specs from nomos-glashuette.com (29.5 × 29.5 × 6.5 mm, 40.5 mm lug-to-lug, 18 mm lugs, 5 atm, sapphire, DUW 4001); diameterMm holds the case width. Launch year of ref. 406 not published. Drawing: the real dial prints numerals only at 12, 2, 4, 8 and 10 with batons elsewhere, and the small seconds sit in a square frame.
The illustration is a bezelga rendering generated from the specifications. It is not a photograph and may simplify details such as logos, text and finishing.
No licensed photography yet.
