Rolex Day-Date 'Yellow Mother of Pearl' World Timer and these early 16570s are

and these early 16570s are considered by many to be the last great Rolex sports model with this feature

Since it's birth

and continually push the envelope for innovative developments in precise timekeeping

When approached by astronauts with complaints that the crown of straight-lug Speedmasters

Rolex Day-Date 'Yellow Mother of Pearl' World Timer and these early 16570s areDouble Quickset Day Dates were once a thing of fantasy. Early Day Date models offered no Quickset functionality, meaning that both the Day and Date functions had to be manually set with a fair amount of winding, mind you by the user in order to display the correct information on the calendar complications. by the late 1970s, Rolex had improved the system and began offering Single Quickset versions in the 'five digit' References based on the 18038.