The teal is taken from the tropical parrotfish, which earns its place on a dive watch by eating the algae that would otherwise smother a coral reef — and the seconds hand answering it is coral red, tipped at both ends with the Trident’s little forks. The dial is pressed into shallow waves that catch the light as your wrist turns. Limited to 500, water resistant to 200m, and £30 per watch goes to Blue Marine Foundation.