Reference 1680 represents the Submariner's evolution from instrument to icon. This 40mm stainless steel model pioneered the date complication for Rolex divers, delivering professional capability with the Cyclops that became a Submariner signature. The case is crafted from solid Oystersteel in Rolex's signature architecture, featuring a unidirectional rotatable bezel with black aluminum insert and a screw-down Twinlock crown for proven water resistance. Inside beats the COSC-certified Superlative Chronometer Caliber 1575, an automatic self-winding movement with hack seconds and date function. The matte black dial, framed by an acrylic crystal with Cyclops magnifier, displays tritium "SWISS-T<25" luminous plots and Mercedes hands for unmatched underwater legibility. Water-resistant to 200 meters and fitted to a stainless steel Oyster bracelet with folding fliplock clasp, it embodies the tool-watch authenticity that made the Submariner an icon.