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A Lange & Sohne Lange 31 Mens Watch 130.025 Collection

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Nov 12, 2008, 3:57:45 AM11/12/08

A Lange & Sohne Lange 31 Mens Watch 130.025 Collection

Watches Collection Site : http://www.watches-collection.com/
A Lange & Sohne Lange 31 Mens Watch 130.025 View Full :
http://a-lange-sohne.watches-collection.com/A-Lange-Sohne-Lange-31-Mens-Watch-130025.html

A Lange & Sohne Lange 31 Mens Watch 130.025 AdditionalInfo :

Brand : A Lange & Sohne ( http://a-lange-sohne.watches-collection.com/
)
Gender : Mens
Code : 130.025
Also Called : $ 130025
Movement : Manual Wind
Bezel : Fixed
Case Material : Platinum
Case Diameter : 15.9 mm
Dial Color : Silver (solid)
Crystal : Sapphire Crystal
Clasp : Leather - Black Crocodile
Water Resistant : 30m / 100ft (suitable for splashing, light rain;
unsuitable for swimming or diving)

Includes boxes, papers & original warranty. The LANGE 31 is the
world's first mechanical wristwatch with a power reserve of 31 days
and a constant-force escapement that powers the going train with
constant torque delivery. The tremendous amount of energy needed to
keep the watch running so long is transferred to the movement with a
winding key and stored in a twin mainspring barrel. The Lange 31 is
yet another example of A. Lange & Shne's ability to redefine
benchmarks in precision watchmaking. For an entire month, the
mechanism assures the highest level of rate stability and rate
accuracy. Thanks to its unmatched autonomy, the LANGE 31 offers a
useful benefit you may forget to wind it once in a while. Because
even if you take the watch off, it keeps telling the right time for as
long as 31 days. To emphasize this special functionality, the solid-
silver dial bears the inscription Monats-Werk. Additionally, the power-
reserve indicator was accorded ample space on the right-hand side of
the solid-silver dial. The patented outsize date on the left-hand side
harmoniously balances the face. A glance at the case back
reveals another construction that is very rare in precision
watchmaking the key-winding mechanism. It was explicitly designed for
and matched to this watch. It allows a considerably larger winding
transmission ratio than would be possible with a crown. So fewer
revolutions are needed, and the energy can be built up faster and more
conveniently. The key is inserted through an aperture in the sapphire-
crystal caseback. Three seals between the winding mechanism and the
case protect the watch against ingress of water up to a pressure of 3
bar. To prevent inadvertent over-tightening of the mainsprings, the
key features an integrated torque limiter. An attempt to turn the key
further - once the mainspring is fully wound - disengages the
triangular toothing of two wheels inside the key and interrupts the
flow of power. The L034.1 manufacture movement in the LANGE 31
is a true power pack. In a space with a diameter of 37.3 millimetres
and a height of 9.6 millimetres, it stores the energy needed to keep
running non-stop for 31 days. Two crucial questions had to be answered
by Lange's calibre engineers: how can so much energy be stored in a
movement? And, just as important: how can this energy be delivered in
a controlled manner? The energy storage function is handled by the
large twin mainspring barrel - two stacked spring barrels, in fact,
with an inside diameter of 25 mm. They contain the two mainsprings,
each of which is 1,85 meters long five to ten times as long as the
springs of conventional mechanical wristwatches. When fully wound,
their combined energy is equivalent to more than 3 joules. The
torque delivered by the mainspring barrel has its maximum when the
spring is fully wound and then declines perceptibly as the spring
relaxes. This changes the rate parameters of the movement, especially
in watches with large power reserve values. To eliminate this unwanted
effect in the LANGE 31, the manufactory integrated a constant-force
escapement. The main element of this mechanism is a pretensioned
spiral spring that is quickly re-tightened on the fly at intervals of
ten seconds. During the ten seconds that follow, the energy stored in
the spring is delivered to the going train in a controlled manner. The
torque output is virtually constant and powers the watch uniformly
throughout 31 days. Apart from its innovative technology, this
movement stands out by virtue of its aesthetic appearance. It
showcases everything that makes Lange watchmaking artistry so
desirable: attractive traditional elements such as the screw balance,
the whiplash precision index adjuster on the hand-engraved balance
cock, and three screwed gold chatons. Not to mention the superb finish
of all parts that is so typical for Lange.

The A Lange & Sohne Watches Collection Series :

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