Nomos Glashütte Tangomat Ref. 641

The NOMOS Tangomat 641 debuted in 2005 as the automatic counterpart to the Tangente, originally powered by the Epsilon movement. That calibre was historically important for NOMOS, as it marked the brand’s transition into in-house automatic movement production in 2005. The current version of this reference uses the DUW 5001, while retaining the 38.3mm stainless steel Tangomat case, white silver-plated dial, tempered blue hands, and closed stainless steel back. The stainless steel case measures 38.3mm in diameter, 8.3mm in height, and 48.0mm from lug to lug. It is fixed with six screws and fitted with sapphire crystal glass on the front. Water resistance is rated at 3 atm, making the watch splash-proof. Compared with the Tangente, the Tangomat has a larger and more substantial case profile, with more prominent angular lugs and the additional height required by the automatic movement. The galvanized white silver-plated dial follows the Tangente-derived layout, with black Arabic numerals, baton hour markers, a railway minute track, and a small seconds display at 6 o’clock. The hands are made of steel and tempered blue, a traditional heat-treatment process that gives them their characteristic blue colour. The overall layout remains close to the Tangente, but scaled to suit the larger automatic case. Inside is the NOMOS DUW 5001, an in-house automatic movement that supersedes the Epsilon calibre used when this reference first appeared. It measures 4.3mm in height, has a diameter of 31.0mm, and offers a power reserve of up to 43 hours. The watch is fitted to a black Horween Genuine Shell Cordovan strap with a 20mm lug width.