====== MB R100 ======
{{wst>image_cr|Montblanc|MB R100|Montblanc Calibre MB R100}}

Calibre **MB R100** is a hand-wound [[chronograph]] watch movement produced [[in-house]] by [[Montblanc]].

In an attempt to be taken seriously as a [[manufacture]], Montblanc worked with other [[Richemont]] units, especially including [[ValFleurier]] to develop their own in-house chronograph movement. This work resulted in the [[2007]] introduction of calibres [[MB R100]] (hand-wound) and [[MB R200]] (automatic). Both are [[double-barrel]] [[mono-pusher]] [[chronograph]] movements with date function, though Cal. MB R100 has a [[power reserve indicator]] on the reverse while Cal. MB R200 has a 12-hour [[second time zone]] complication with [[day/night indicator]] instead.

The dial arrangement of both calibres is unusual The time display is shifted towards 12 00, making room for chronograph minute and hour discs at roughly 4 30 and 7 30. There are no running seconds. Displaying the chronograph time on a disc is reminiscent of the early chronographs created by [[Nicolas Rieussec]], for whom Montblanc named the series of watches containing these calibres. Cal. MB R100 includes a central date hand or disc. A later variant includes day and date apertures at 9 00 and 3 00, similar to the day/night and rising date apertures on Cal. MB R200.

The top plate of the movement is nearly solid, stretching from 8 00 to 4 00. It is decorated with [[Geneva waves]] and includes the text, "Montblanc/Le Locle/Twin Barrels". A thick bridge rests just beneath this with an individual movement number and "Cal. MB R100" engraved on it. Beneath this bridge, the symmetrical [[going train]] wheels are visible along with the [[vertical coupling]] for the mono pusher chronograph. At 6 00, the [[Gyromax]] balance is clearly visible. An aperture in the top plate allows the [[column wheel]] to be viewed. Another aperture at 12 00 includes a [[power reserve indicator]] hand and a view of the gears below.

===== Variations =====
Although the calibre in all automatic Nicolas Rieussec watches is marked MB R100, many variations have appeared. All feature the same basic functions with very little difference in movement architecture.

  * MB R100
    * [[2008]] [[Montblanc Star Nicolas Rieussec Monopusher Chronograph|Star Nicolas Rieussec Monopusher Chronograph]]
  * MB R110 - Date disc instead of wheel
    * [[2009]] [[Montblanc Star Nicolas Rieussec Monopusher Chronograph Open Date|Star Nicolas Rieussec Monopusher Chronograph Open Date]]
    * [[2011]] [[Montblanc Nicolas Rieussec Chronograph Anniversary Edition|Nicolas Rieussec Chronograph Anniversary Edition]]
  * MB R120 - Silicon escapement and date disc
    * [[2010]] [[Montblanc Nicolas Rieussec Chronograph Silicon Escapement|Nicolas Rieussec Chronograph Silicon Escapement]]

===== See Also =====
  * [[MB R200]] - A related automatic movement from Montblanc
  * [[MB LL100]] - A similar but unrelated automatic chronograph movement from Montblanc

===== External Links =====
  * [[http://www.watchprosite.com/?page=wf.forumpost&q=&fi=1006&ti=918053&pi=6318708|The Montblanc Nicolas Rieussec Chronograph Collection: Compare all the variations!]]


<WRAP ud ud_mov>

**Description:**
  * [[Hand-winding]] [[mono-pusher]] [[column wheel]] [[chronograph]]
  * [[Double barrel]]
  * [[Gyromax]] balance

**Functions:**
  * Hour and minute hands
  * [[Date]]
  * Chronograph seconds and 30-minute counters

**Data:**
  * Ø 31 mm, H 7.6 mm
  * 28,800 A/h
  * 33 jewels
  * [[Kif]]
  * [[Column wheel]] with [[vertical clutch]]
  * [[Double barrel]]
  * [[Power reserve]] 72 hours

**Production period:**
  * [[2007]]-present
</WRAP>

{{tag>Movements Double_barrel_movements Chronograph_movements Monopusher_chronograph_movements Montblanc_calibres}}