Zelos Hammerhead II Long-time fans of Zelos surely know the Zelos Hammerhead, a chunky cushion-shaped style dive watch that has proven to be one of their best selling models. Because of that, Zelos has recently released the Hammerhead II. While the Hammerhead has had a few variations through the years, this second edition is updated with a slightly new dial, a Helium Release Valve and a new ...