If there’s one thing I love about Citizen, it’s their dedication to making rugged, go-anywhere watches that don’t need mollycoddling. Their latest, the Citizen Promaster Eco-Drive Professional Diver 300m, continues that tradition with a solar-powered movement that keeps ticking for a full year on a single charge. Yes, 365 days – without ever seeing a sliver of sunlight.

That’s thanks to the Cal. E365 movement, a technological marvel designed to withstand the darkest, deepest dives while still running like clockwork.