The NOMOS Tetra Terra, identified by reference 438.SB, presents itself as the closed-back variant in the Tetra Origins collection. This model features a striking terracotta red dial housed within a square case made of stainless steel, measuring 29.5mm on each side. It is complemented by rhodium-plated hour and minute hands, alongside a vibrant turquoise seconds hand, all powered by the hand-wound DUW 4001 caliber. Among the four variants in the Tetra Origins lineup—Terra, Ochra, Salvia, and Basalt—Terra is characterized by its warm hue.

The case dimensions are precisely 29.5mm wide, 29.5mm long, and 6.5mm high, with a lug-to-lug measurement of 40.5mm. Secured with four screws, it features a durable sapphire crystal on the front and a solid stainless steel back. Designed with a slim silhouette, the Tetra's distinctive double lugs significantly enhance its visual appeal, while its water resistance rating of 5 atm adds to its functionality. The terracotta dial showcases a blend of numeral styles along with a square minute track and a small seconds sub-dial positioned at 6 o'clock, embellished with subtle lavender, yellow, and light blue accents. The watch is finished with an elegant beige vegan velour remborde strap that fits 18mm lugs.