3156

The Day-Date II utilizes the calibre 3156, a self-winding mechanical movement created and produced solely by Rolex. It includes a calendar disc system for both day and date. Equipped with a Parachrom hairspring and Rolex-engineered Paraflex shock absorbers, the 3156 provides enhanced durability against impacts and harsh environments. As a certified Swiss chronometer, this movement meets the rigorous precision standards of the Swiss Official Chronometer Testing Institute (COSC), and its Oyster-based architecture ensures exceptional reliability.