Ulysse Nardin 660-88/212 Sonata Dual Time 18K White Gold Gray Dial

Reference 660-88 belongs to Ulysse Nardin's Sonata line, a technically ambitious series that paired the brand's dual time display with a mechanically sophisticated alarm architecture in the 2000s. This white gold example presents the less common gray dial configuration, with the line's distinctive multi-register layout: alarm setting, alarm countdown, second time zone, alarm on and off indication, and double date. Ulysse Nardin powered the watch with caliber UN-66, an automatic movement built for the Sonata platform and notable for integrating the alarm and dual time functions into a layout that remains unusually legible despite its complexity. The visible mechanism on the dial side is part of what gives the Sonata its appeal to collectors, since the watch does not hide the technical content that defines the reference. At 42mm in 18K white gold, it has the substantial presence associated with mid-2000s complicated watches, but the case profile stays balanced rather than oversized. The Sonata family sits in an important period of Ulysse Nardin production, when the brand was pushing proprietary complications and distinctive case architecture well beyond its marine chronometer identity. This reference is not a limited edition or known country or boutique exclusive based on the publicly verifiable information available, so its relevance comes from the model itself rather than a market-specific run. Collectors tend to focus on the Sonata because few alarm watches of its era combined a practical dual time display, large date, and such an animated dial-side mechanical presentation in a precious metal case. For a buyer interested in early 21st century independent-minded Swiss complication design, 660-88 is one of the more characterful white gold references in the Ulysse Nardin catalog. Excellent Condition with Ulysse Nardin box, service papers dated 2025, and papers dated 2004.