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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 5046 (2015-present)
- Cal. 51950 (2015-present) - Perpetual calendar
Description:
- Automatic movement
- Bi-directional winding (Pellaton winding system) on spring-mounted rotor, cam disc, ruby wheels and 2 latches on ratchet wheel, gear reduction 175 1
- Escapement stone lever
- Two-armed screw balance with 16 weight srews and 2 adjustment eccentrics on the escapement arms
- Hairspring Nivarox 1 with Breguet bending
- IWC precision adjustment hairspring stud and regulator adjustable with eccentric
- Weight segment IWC-style (without gold medaillon) with gilded Probus-Scafusia engraving, plate wheel, crown wheels, ratchet, barrel lid and differential gear with solar grinding
Functions:
- Hours, minutes
- Tourbillon at 12 00
- 50900
- Retrograde power reserve indicator at 4 30
- Small seconds at 9 00
- 51900
- Retrograde power reserve indicator at 3 00
- Retrograde date by pointer at 7 30
Data:
- 16,75 lignes
- Ø 38.2 mm
- Height 8.9 mm
- 44 jewels
- 19,800 A/h
- Power reserve 204 h, limited to 168 h
Production period:
- Production 2004-Present