Ulysse Nardin's designs have long been tied to the ocean and marine life, and the latest offering in the Swiss brand's 'Diver' collection highlights the vulnerable status of the lemon shark. Part of its ongoing collaboration with ocean data research charity OCEARCH and Florida International University, this watch is limited to a 300-piece run and individually numbered on the side of the blackened stainless steel case. Fitted with a webbing strap that's made from recycled salvaged fishing nets, it's water-resistant to 300m and engraved with three sharks on the case back. Note the touches of yellow at the bezel, dial and crown, which reference the hue of the magnificent fish.

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