Launched in 1967, reference 1680 was the first Submariner model to be fitted with a date function. Throughout its production run, reference 1680 was released in various batches, each with its distinctive dial and bezel attributes.

The present watch is among the first examples produced. It is fitted with a rare mk 1 dial, evidenced by the 'meters first' depth rating and 'closed' sixes. The serial number also supports this hypothesis, and matches the dial configuration. The dial has remained black over time, which is correct for mk 1 dials. Statistics show that only mk 2 Red Submariner dials 'turn' a tropical brown shade. Mk 1 dials are considered the rarest, and earliest, models in the 1680 family. According to our research, only 1.6% of the entire production run feature the mk 1 dial. The luminous has futhermore aged to a warm orange tone, which is consistent with the hands. This aging process gives the watch so much character, displaying the rich history of the time piece. The clasp is stamped for the fourth quarter of 1969, leading us to believe the bracelet is original to the watch.