====== Nomos Delta ======
{{wst>image_r|Nomos_Delta_ZB|Nomos Delta (dial side)}}
{{wst>image_r|Nomos_Delta|Nomos Delta}}
[[Nomos]] **Delta** (δ) is a [[manual winding]] movement with [[date display]] and a [[power reserve indicator]]. It is an evolution of the predecessor [[Nomos 1 TSDPG]] and was produced from [[2005]] until [[2016]] before being replaced by [[DUW 4401]].

===== Overview =====
The [[2005]] introduction of the [[Nomos Alpha|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]]. The gear train is similar to the classic [[Peseux 7001]], but was placed in a new enclosure based on the classic [[Glashütte]] [[three-quarter plate]] design. Nomos updated many of the components, adding [[hacking seconds]], and completely reworked the finishing with [[rhodium]]-plated surfaces, [[blued screws]], [[Glashütte Stripes]], and Glashütte [[solar grinding]] or [[Langeleist-Perlage]].

Calibre Delta (with [[date]] and [[power reserve indicator]]) was released at the same time as [[Nomos Alpha]] (without [[date window|date]]) and [[Nomos Beta]] (with date). All three are hand-winding movements, as was the [[Nomos Gamma]] which followed in [[2007]]. In [[2006]], Nomos followed with a family of [[automatic]] movements, [[Nomos Epsilon|Epsilon]], [[Nomos Zeta|Zeta]], and [[Nomos Xi|Xi]], with similar features. Alpha is smaller than the others, however, at just 23.3 mm diameter and 2.6 mm thick.

The Beta and Delta movement adds an unusual and patented date display. 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 Beta and [[Nomos Delta|Delta]] nearly as thin as the [[Nomos Alpha|Alpha]], on which they are based. The [[power reserve indicator]] is also integrated into the bottom plate of the movement, adding no additional thickness. It shows the remaining power in the mainspring, serving as a reminder to wind the watch.

For the [[Nomos Tangente Observatory|Tangente Observatory]], the date index is modified to function as a day/night display.

A direct successor to the Nomos Delta was introduced in [[2014]], the [[DUW 4401]] featuring the [[Nomos Swing System]]. The Beta calibre was phased out after this and removed from the catalog in [[2016]].

This movement is officially named using the Greek letter "δ", but Nomos often writes it as "Delta".

===== Applications =====
  * [[Nomos Club]]
  * [[Nomos Club Campus 36]]
  * [[Nomos Club Campus 38]]
  * [[Nomos Ludwig]]
  * [[Nomos Ludwig 33]]
  * [[Nomos Ludwig 38]]
  * [[Nomos Metro 38]]
  * [[Nomos Orion]]
  * [[Nomos Orion 33]]
  * [[Nomos Orion 38]]
  * [[Nomos Tangente]]
  * [[Nomos Tangente 33]]
  * [[Nomos Tangente 35]]
  * [[Nomos Tangente 38]]
  * [[Nomos Tangente Sport]]
  * [[Nomos Tetra]]
  * [[Nomos Tetra 27]]

===== See Also =====
This movement is part of a family of Nomos movements produced since [[2005]]. The movement is partially made [[in-house]], though the [[assortment]] is supplied by a third-party. It was supplanted by the in-house [[Nomos Swing System]] family starting in [[2014]].

    * [[Nomos Alpha]] Hand winding
    * [[Nomos Beta]] Hand winding, date
    * [[Nomos Delta]] Hand winding, date, power reserve indicator
    * [[Nomos Epsilon]] Automatic
    * [[Nomos Zeta]] Automatic, date
    * [[Nomos Gamma]] Hand winding, power reserve indicator
    * [[Nomos Xi]] Automatic, GMT or world time
    * [[Nomos Alpha.2]] Hand winding, 2 hands


<WRAP ud ud_mov>

**Manufacturer:**
  * [[Nomos]]

**Description:**
  * [[Manual winding]] movement
  * [[Shock protection]]
  * [[Escapement]] stone lever
  * [[Yoke winding system]]

**Functions:**
  * [[Small seconds]]
  * [[Date display]]
  * [[Power reserve indicator]]

**Data:**
  * 14½ [[ligne]]s
  * D 32.15 mm, H 2.8 mm
  * 23 [[jewels]]
  * 21,600 A/h
  * Power reserve About 42 hours

**Extras:**
  * [[Hacking seconds]], date, [[power reserve indicator]]
  * [[Triovis fine regulation]]
  * Glashütte [[solar grinding]] on ratchet and crown wheel
  * Glashütte [[three-quarter plate]]
  * [[Glashütte ratchet]]

**Production period:**
  * Production [[2005]]-[[2016]]
  * Predecessor [[Nomos 1 TSDPG]]
  * Successor [[DUW 4401]]
</WRAP>

{{tag>Movements Manual_winding_movements Nomos_calibres}}