====== Lange L034 ======
{{wst>image_cr|Lange|L034.1}}

**Lange L034.1** is a caliber by [[A. Lange & Söhne]].

[[Hand-wound]] [[manufacture]] movement with [[small seconds]], [[big date]] and [[power reserve indicator]].

World's first mechanical caliber with a power reserve of 31 days and a [[constant-force]] escapement. The two mainsprings located in the [[double barrel]] are five to ten times longer than conventional mechanical wristwatch movements, each measuring 1,850 millimeters.

Used in the [[A. Lange & Söhne Lange 31]] model.

<WRAP ud ud_mov>
**Description:**
  * [[Hand-winding]] movement with [[key wind-up]]
  * [[Double barrel]], [[constant-force]] escapement for controlled [[torque]]
  * [[Balance cock]] engraved by hand
  * Shock-resistant [[Glucydur]] [[screw balance]]
  * [[Swan's neck fine regulation]]
  * [[Plate]]s and [[bridge]]s in untreated [[Nickel silver]]

**Functions:**
  * Hours, minutes
  * [[Big date]]
  * [[Small seconds]]
  * [[Power reserve indicator]]

**Data:**
  * Ø 37.3 mm, height 9.6 mm
  * 61 [[jewels]], including 3 in screwed gold [[chaton]]s
  * 21,600 A/h
  * Number of components 406
  * Power reserve 31 days

**Production period:**
  * From [[2007]]
</WRAP>

{{tag>Movements Manual_winding_movements Double_barrel_movements A._Lange_&_Söhne_calibres}}