The first major redesign was introduced around 2007, with a chronograph-only reference 3764. It had a complex tonneau shaped case, with negative curves as part of the design, and was relatively large at 44 by 51 mm. Most importantly, it also debuted IWC’s first in-house chronograph, calibre 89360. This was a major development for IWC –a striking new case with a major new movement. It was intended to be as avant-garde for its era as was the 1985 Da Vinci. The radical case design was used, in several variations, over the next 10 years. With a redesign to be more hexagonal, a time/date-only version was introduced a year later for IWC’s 140th anniversary in 2008, paying homage to reference 3501 as part of the “Vintage Collection”.
With the “original” case from reference 2007, IWC also produced a special perpetual calendar model. This edition, limited to 3000 examples, honored Kurt Klaus, with his image laser-etched on the case back. It used calibre 79261, based on a Valjoux 7750 like the original perpetual Da Vinci rather than IWC’s new in-house movement. IWC subsequently used its new in-house chronograph movement in a special perpetual calendar Da Vinci. This model, reference 3761, contained a very special digital date-month indication. Again, it was a revolutionary design –a bold new movement in a bold case.