I’ve owned my Seiko Marinemaster SBDX001 for over ten years, and it impresses me as much today as it did back in 2015. Such as the Hardlex crystal, steel bezel insert, and flimsy-feeling clasp and diving extension. With the Marinemaster HBF001, the brand finally made several fundamental changes. The Seiko 8L45 offers 72 hours of power reserve, as stated on the dial, and has improved accuracy. The clasp and its diving extension are what kept my trusty Marinemaster SBDX001 away from being near-perfect.