Nomos Glashütte Tetra Salvia / Closed Case Back Ref. 439.SB

Reference 439.SB is the closed-back version of the NOMOS Tetra Salvia, part of the Tetra Origins series. It combines the square 29.5mm stainless steel Tetra case with a sage green dial, rhodium-plated hands, a turquoise seconds hand, and the hand-wound DUW 4001 calibre. Within the four Tetra Origins executions, Salvia is the muted green version, alongside Ochra, Terra, and Basalt. The stainless steel case measures 29.5mm by 29.5mm, with a height of 6.5mm and a lug-to-lug length of 40.5mm. It is fixed with four screws and fitted with a sapphire crystal front and a closed stainless steel back. The Tetra’s double lugs remain one of the defining external elements of the design, while the slim case height keeps the square format relatively flat. Water resistance is rated to 5 atm. The sage green dial uses the Tetra’s mixed numeral and marker layout, with a square minute track and a small seconds display at 6 o’clock. The sub-dial combines yellow and two blue tones, while the turquoise seconds hand adds a brighter colour accent within the display. Rhodium-plated hour and minute hands contrast with the muted green dial surface. Power comes from the NOMOS DUW 4001, a manually wound in-house calibre measuring 10 ½ lignes in diameter and 2.6mm in height. It has 17 jewels, a power reserve of up to 53 hours, and uses the NOMOS swing system. The watch is supplied on a beige vegan velour remborde strap with an 18mm lug width.