Rolex Caliber 3155

Operating at 28,800 vibrations per hour (4 Hz), the 3155 maintains a smooth second-hand sweep and consistent accuracy. It is COSC-certified, ensuring performance that meets strict chronometer standards. Rolex designed the movement with a robust free-sprung balance and a Breguet overcoil, supporting long-term stability and resistance to positional variations. The Caliber 3155 uses Rolex’s bidirectional Perpetual rotor system for efficient automatic winding, helping the watch stay fully powered with ordinary wrist motion. The movement also features a strong balance bridge and shock-resistant components to enhance durability. Built with serviceability in mind, the 3155 remains one of the most respected Rolex calibers from the late 20th and early 21st centuries. Its dependability, straightforward maintenance, and excellent day-date functionality make it a favorite among collectors and Day-Date enthusiasts.