Ulysse Nardin Marine Torpilleur Steel — White Dial | Ref. 1183-310-3/40

Caliber UN-118 occupies a distinctive position within Ulysse Nardin's movement architecture: it is the calibre that makes the silicon and Diamonsil technology developed through the InnoVision research programme available across the widest range of references in the Marine and Diver collections, carrying both a COSC chronometer certificate and Ulysse Nardin's own performance certificate — a double validation of accuracy that is unusual at this price level and reflects the movement's genuine precision heritage. The Marine Torpilleur's 42mm stainless steel case is the natural setting for a calibre of these credentials: a sports-proportioned case with a screw-down security crown, sapphire crystal, and rubber folding-buckle strap that communicate active-wear intent without abandoning the Marine collection's naval elegance.

The silicon escapement components — escapement wheel and anchor — operate without lubrication, resist magnetism, and maintain their dimensional stability across temperature extremes that would affect conventional brass or steel components. The Diamonsil technology, which deposits diamond-like carbon onto silicon components, further reduces friction and increases the surface hardness of the escapement to levels unachievable with conventional watchmaking metals. Combined with the 60-hour power reserve that the UN-118's efficient architecture delivers, these material innovations produce a movement whose long-term accuracy and low-maintenance characteristics exceed those of comparable conventionally-constructed calibres at equivalent price points. The oversized seconds hand is the UN-118's most visible design signature — a direct reference to the precision chronometer conventions of Ulysse Nardin's 19th-century marine instruments.

The white dial provides maximum legibility in the Marine Torpilleur's active-wear context: its clean surface hierarchy, with the date and power reserve indicator integrated without crowding, reflects the instrument-watch design discipline that the Torpilleur name — recalling the torpedo boats whose crews relied on precision timepieces for navigational coordination — demands. Water resistance to 50 metres accommodates aquatic exposure. For the collector who wants genuine silicon escapement technology, dual certification, and a 60-hour power reserve at a price accessible to the serious enthusiast, the Marine Torpilleur with UN-118 is among the most compelling value propositions in the Ulysse Nardin range.