IWC 50900
Cal. 50900 is an oversized in-house eight day tourbillon movement in the Cal. 50000 family produced by IWC since 2010.
History
On its release in 2000 in the limited-edition IWC Portugieser 2000, IWC's Cal. 5000 was lauded by the brand's followers. It marked the restart of completely-in-house watch movement development for the company and brought back the legendary Pellaton winding system. The movement was seen as a landmark in other ways, with 8-day power reserve, automatic winding, and a massive 16.75 ligne (38.2 mm) diameter.
In 2004, IWC introduced the Portugieser Tourbillon Mystère, Ref. 5042 with a new version of the Cal. 5000. The new Cal. 50900 adds a tourbillon and retrograde power reserve indicator to the movement family. The tourbillon is visible through an opening in the dial at 12:00, while the retrograde power reserve needle sits at 4:30. Running small seconds are placed at 9:00.
In 2010, IWC introduced the Portugieser Tourbillon Mystère Rétrograde, Ref. 5044 with a new version of the Cal. 50900. The new Cal. 51900 adds a retrograde date by pointer at 7:30 to the movement. The power reserve indicator is also retrograde and is moved back to 3:00.
Cal. 51900 was updated in 2017 with a perpetual calendar module to become Cal. 51950. This was used in the limited-edition Portugieser Perpetual Calendar Tourbillon "150 Years", Ref. 5045.
Applications
- Cal. 50900 (2004-2009) - Power reserve indicator at 4:30
- IWC Portugieser Tourbillon Mystère 5042 (2004-2009)
- Cal. 51900 (2010-present) - Retrograde date at 7:30
- IWC Portugieser Tourbillon Mystère Rétrograde 5044 (2010-2014)
- IWC Portugieser Tourbillon Mystère Rétrograde 5046 (2015-present)
- Cal. 51950 (2015-present) - Perpetual calendar
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