Rolex Submariner Date World Timer as early as the 1960s—almost

as early as the 1960s—almost 20 years before the Rolex Submariner

this Day-Date Reference 18078 features a factory 'bark'  finished bezel and bracelet

which is useful on a hand-wound watch since it let's you easily tell at a glance if it is wound and running

chronometer papers

dates to circa 1990 and features an 18K yellow gold Oyster case

Rolex Submariner Date World Timer as early as the 1960s—almostIn the early 1980s, Rolex improved upon the original Submariner Date model, releasing the Reference 16800. Improvements over the original 1680 model included a uni directional ratcheting click bezel, a sapphire crystal with a lower profile and a quick set date function. The 16800 was also given an increased depth rated to 300m, up from the 200m depth rating of the 1680. A high beat movement was also added, offering additional accuracy. Early 16800