Seiko’s green Marinemaster HBF003 takes its colours from coastal mangroves

Seiko’s Marinemaster 1968 Heritage Save the Ocean HBF003 gives the professional diver a mangrove-inspired green dial and a rose-gold-coloured seconds hand. The worldwide edition is limited to 900 watches, including 300 for Japan. Its steel case measures 42.6mm across and combines a ceramic-insert bezel with a dual-curved sapphire crystal.

The automatic 8L45 movement runs at 28,800 vibrations per hour and provides approximately 72 hours of power reserve. Water resistance is rated to 300 metres, and the bracelet’s push-button adjustment system offers up to 16mm of extension in eight steps. Seiko’s Japanese online store lists a release on 7 November 2026, with local preorders beginning on 8 October; availability elsewhere may differ.