The Serket Reef Mariana (black dial, black bezel) is a 200m automatic dive watch in a 40mm brushed-and-polished 316L stainless steel case with a 120-click unidirectional black ceramic bezel and a lumed pip at 12. The black dial runs a Seiko NH35 automatic with date at 3 and BGW9 blue lume under an anti-reflective sapphire crystal, with a scorpion engraved on the caseback. A screw-down crown with guard keeps it dive-ready, and it ships with both a steel bracelet and a matching G10 fabric strap.