The present example has a dial that falls into the Mark IV category. This is apparent from the 3.4 million serial number range and the "open sixes" found on the depth rating. The single red line is a very coveted feature of the 1680. Brand: Rolex Reference: 1680 Movement: 1575 Year: 1973 Case: 39mm Bracelet: Rolex stainless steel, 9315 bracelet with 380 endlinks and divers extension. Crystal: Plexiglass Box & papers: No Location: Los Angeles Price: $16,449 or best offer CA residents may be subject to tax Pictures: [https://imgur.com/a/UcTQe79](https://imgur.com/a/UcTQe79) Timestamp: [https://imgur.com/a/GdkVP2Y](https://imgur.com/a/GdkVP2Y) CONDITION & SERVICING \- The case has been previously polished and has light wear from use. \- The engravings are light but visible via a loupe. \- The matte dial is in excellent condition. \- The lume plots and hands match showing slight wear and similar color. \- The bracelet has light to average stretch for its age. \- Service history is unknown.