A ship’s chronometer for the wrist, in rose gold.

Before satellites, a ship found its longitude with a marine chronometer, a clock accurate enough that the difference between its time and local noon gave the distance east or west of Greenwich. Ulysse Nardin of Le Locle supplied those chronometers to more than fifty navies, and the Marine Chronometer wristwatch borrows the layout: a power reserve at twelve so you know how much running time is left, and the seconds at six.

The UN-118 inside is the first movement Ulysse Nardin built entirely in-house, with an escapement of silicon coated in synthetic diamond, which needs no lubrication, and a silicon balance spring. It is certified by the Swiss chronometer office, COSC.

The Amazon table calls this a chronograph and says it is battery powered. Neither is true: the Marine Chronometer Manufacture is an automatic three-hander with a power reserve indicator and a date. The reference in the title, the photograph and the dial, which reads Certified Chronometer, are the guide.

Every figure here comes from the Amazon spec table where it is right and from Ulysse Nardin’s published specification for the reference, not from handling the watch. Two hundred metres of water resistance is unusual on a gold dress watch and is the marine heritage showing.

This unit is listed new by an independent dealer through Amazon, with Amazon’s 30-day return window on top of the dealer’s warranty; read the warranty line on the listing, because Ulysse Nardin’s own warranty runs from an authorised sale.

Gold Ulysse Nardins resell below their retail price on the secondary market, which is why dealer stock sits on Amazon under boutique retail. Buy it for the movement and the story. Nothing here is investment advice.