What does Oyster Perpetual mean on a Rolex watch?

An Oyster Perpetual on a Rolex watch refers to the watch's ability to run on the energy generated by the wearer's wrist movements rather than manual winding. At Baselworld in 2015, a variety of Rolex watches with a new-generation Oyster Perpetual movement were unveiled. Find a variety of vintage Rolex watches on 1stDibs.