IWC 50000

Template:File The Cal. 50000 family is a group of large automatic seven-day watch movements by IWC produced 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 resurrected the legacy IWC Portugieser watch design. 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.

Most importantly, Cal. 5000 brought back IWC's legendary Pellaton winding system. For its second life, the Pellaton system gained two pawls instead of one, with both pulling the massive 8-day mainspring barrel whenever the rotor turned in either direction. The rotor too was a massive one, both to fit the movement diameter and to wind that over-sized spring. Indeed, the rotor includes its own shock absorber to resist breakage in daily use.

Another concession to the massive mainspring, with its varying isochronism, is the use of two different regulating mechanisms. The traditional IWC balance wheel features an adjustment screw on each of its two arms, and a conventional screwed index is also provided on the bridge. This allows the watchmaker to adjust the watch for timekeeping over a short or long duration. The balance wheel is quite large as well, ticking at a slow 18,000 A/h, and is said to be the same as found in the predecessor Portugieser movement, Cal. 89. A final nod to power reserve is the use of a mechanism to stop the balance after 7 days, retaining the final day of reserve to restart the watch when it is picked up.

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 follow-on Cal. 52000 used double barrel construction to deliver more consistent torque and timing throughout the week.

IWC updated the naming (though the movement stayed mostly the same) around 2005 as Cal. 50010. This movement family is being phased out after 2015 in favor of the newer IWC 52000 series with double barrel power.

Movement family

• IWC 5000 (2000-2001) - small seconds at 9:00, power reserve indicator (IWC Portugieser Automatic 2000)
  • IWC 50010, 18,000 A/h (2004)
    • IWC 51010, 21,600 A/h (2005)
      • IWC 51011, 21,600 A/h (2007)
• IWC 5011, 18,000 A/h (2002) - central seconds, power reserve indicator, date (IWC Big Pilot's Watch 5002)
  • IWC 51110, 21,600 A/h (2006) - (IWC Big Pilot's Watch 5004)
    • IWC 51111, 21,600 A/h (2008) - (IWC Big Pilot's Watch 5004)
    • IWC 51113, 21,600 A/h (2007) - (IWC Big Ingenieur 5005)
• IWC 50611, 18,000 A/h (2003-2005) perpetual calendar, double moon phase indicator
  • IWC 51610, 21,600 A/h (2006-2007) - perpetual calendar, small seconds, power reserve indicator (IWC Portugieser Perpetual Calendar 5022)
    • IWC 51613, 21,600 A/h (2007-2014) - (IWC Portugieser Perpetual Calendar 5023)
  • IWC 51611, 21,600 A/h - (IWC Portugieser Perpetual Calendar)
    • IWC 51612, 21,600 A/h (2005-2007) - (IWC Portugieser Perpetual Calendar 5021)
      • IWC 51614, 21,600 A/h (2007-2015) - (IWC Portugieser Perpetual Calendar 5032)
• IWC 50900, 19,800 A/h (2004-2009) - tourbillon at 12:00, retrograde power reserve indicator at 4:30, small seconds at 9:00
  • IWC 51900 (2010-present) - Retrograde power reserve indicator at 3:00, retrograde date at 7:30
  • IWC 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 Yoke winding system Breguet hairspring Incabloc shock protection 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 Functions: Hours, minutes, small seconds at 9 h Hacking seconds Quickset date feature, jumping Power reserve indicator Data: 16,75 lignes Ø 38.2 mm, H 7,44 mm 44 jewels 18,000 A/h 5000: 286 components 5011: 334 components Power reserve 204 h, limited to 168 h Production period: Production: 2000-Present Successor: IWC 52000

Weblinks

• IWC’s New Calibre 5011, iwcforum.com, Michael Friedberg, April 2002
• IWC Forum: Calibre 5000 & 5011, iwcforum.com, Richard Habring, January 29, 2003
• IWC Reference 5001