The 2005 introduction of the Alpha movement family was an important turning point for Nomos. Although based on the preceding Nomos 1 TSP, it was largely constructed in-house rather than being a refinished ebauche. This was followed in 2006 by the Nomos Epsilon, the first Nomos movement with automatic winding. The next great leap forward for Nomos was the 2014 introduction of the Nomos Swing System, an in-house assortment, in movement DUW 4401. Over the next few years, this technology moved to other models in the Nomos movement family.
Introduced in 2015, the Nomos DUW 4101 movement is a manually wound movement with small seconds at 6 00 and a date wheel. Like other Nomos movements, it is made in a three-quarter plate design, plated with rhodium and decorated with Glashütte ribbing and perlage. The ratchet and crown wheels are decorated with a Glashütte sunburst pattern and blued screws are used. It features Glashütte stopwork, Incabloc shock protection, and 23 jewels.
The DUW4101 movement adds an unusual and patented date display like the Nomos Beta. Typically, a date wheel and associated gears are stacked below the mainplate between the rest of the watch movement and the dial. However, this makes these movements more bulky and thick. Instead, Nomos places the date ring around the movement, with the switching mechanism integrated into the movement itself, making the DUW 4101 just as thin as non-date versions at 2.8 mm. However, this adds to the diameter of the movement, bringing it to 32.1 mm.
Calibre DUW 4101 replaced the Nomos Beta movement, with which it shares many components.