Tetra Die Fuchsteufelswilde / Open Case Back

Reference 475 is the sapphire-back version of the NOMOS Tetra Die Fuchsteufelswilde, with a 29.5mm square stainless steel case, aubergine dial, rose gold-coloured small seconds sub-dial, rhodium-plated hands, a turquoise seconds hand, and the hand-wound Alpha calibre. It follows the same dial and strap configuration as the closed-back version, with the movement visible through a sapphire crystal case back. 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 sapphire crystal case back. The Tetra case is defined by its square shape, flat profile, and stepped double lugs. Water resistance is rated to 3 atm. The aubergine dial uses the Tetra’s mixed numeral and marker layout, with a square minute track and a contrasting small seconds display at 6 o’clock. The rose gold-coloured sub-dial adds a warmer tone within the darker dial, while the turquoise seconds hand provides the main colour accent. The rhodium-plated hour and minute hands contrast with the dial surface. Power comes from the NOMOS Alpha, a manually wound in-house calibre measuring 10 ½ lignes in diameter and 2.6mm in height. It has 17 jewels and a power reserve of up to 43 hours. The movement is visible through the sapphire crystal case back. The watch is supplied on a velvet gray vegan velour remborde strap with an 18mm lug width.