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Cal. 50611 is an oversized in-house eight day perpetual calendar movement in the Cal. 50000 family produced by IWC since 2004.
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 2003, IWC introduced the Portugieser Perpetual Calendar, Ref. 5021 with a new version of the Cal. 5000. The new Cal. 50611 adds a perpetual calendar and double moon phase indicator to the movement family. The circular power reserve indicator dial at 3 00 remains, with date by pointer sharing the space. At 6 00 is a month by pointer dial, with a four-digit year window at 7 30. At 9 00 is small seconds and day by pointer. 12 00 holds a double moon phase indicator. The moon phase indicator is accurate for 577 years, while the perpetual calendar runs to the year 2499.
Cal. 50611 was updated in 2005 with faster 21,600 A/h operation to become Cal. 51612. This was further updated in 2007 as Cal. 51614.
Cal. 51610 was introduced in 2006 with a single moon phase indicator. This was updated as Cal. 51613 in 2007.
The fact that Cal. 5000 uses a single mainspring and barrel has impacted the reputation of this movement. As admitted by Richard Habring and other IWC staff, the watch was meant for “weekend wear” and is thus tuned to keep time accurately over a week. But the single mainspring does not deliver power consistently, so the movement runs quite fast for the first two days, more predictably for the next few, and slows down at the end. This causes issues for timing, maintenance, and daily wear. The next-generation Cal. 52000 family used double barrel construction to deliver more consistent torque and timing throughout the week.
- Cal. 50611 (2003-2005) 18,000 A/h
- IWC Portugieser Perpetual Calendar 5021 (2003-2005)
- IWC Portugieser Perpetual Calendar 5032 (2003-2005)
- Cal. 51610 (2006-2007) 21,600 A/h
- IWC Portugieser Perpetual Calendar 5022 (2006-2007)
- Cal. 51612 (2005-2007) 21,600 A/h
- IWC Portugieser Perpetual Calendar 5021 (2005-2007)
- IWC Portugieser Perpetual Calendar 5032 (2005-2007)
- Cal. 51613 (2007-2014) 21,600 A/h
- IWC Portugieser Perpetual Calendar 5022 (2007-2012)
- IWC Portugieser Perpetual Calendar 5023 (2010-2014)
- Cal. 51614 (2007-2015) 21,600 A/h
- IWC Portugieser Perpetual Calendar 5021 (2007-2010)
- IWC Portugieser Perpetual Calendar 5032 (2007-2015)
- 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
- Bridges and plate nickel coated, engravings gilded, decoration of type “Côtes circulaires”
- 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
- Hours, minutes
- Power reserve indicator and date by pointer at 3 00
- Month by pointer at 6 00
- Four-digit year at 7 30
- Hacking small seconds and day by pointer at 9 00
- Moon phase indicator at 12 00
- 16,75 lignes
- Ø 37.8 mm
- Height 8.8 mm
- 62 jewels
- 18,000 or 21,600 A/h
- Power reserve 204 h, limited to 168 h