This is an 18K Everose gold Rolex Cosmograph Daytona 116515LN. It has an Oysterflex rubber strap with an 18k Everose gold deployment buckle, a scratch-resistant sapphire crystal, and round chronograph pushbuttons. It has a monobloc middle case, a solid screw-down case back, and the Rolex Triplock triple waterproof system winding crown protected by the crown guard. The 40mm diameter solid three-body Oyster case, downturned lugs, and case back are polished/brushed. The black scratchproof Cerachrom bezel is engraved with a tachymetric scale to 400 units/hour. The dial is chocolate brown with applied rose gold baton hour markers and luminous squares, luminous pink gold baton hands, and an outer 1/5th seconds track, There are three matching subsidiary dials – one for the constant seconds at the 6 o’clock position, a 12-hour chronograph totalizer at 9 o’clock, and a 30-minute chronograph register is at 3 o’clock. The chronograph is accurate to within 1/8 of a second, and it has stop seconds for precision time setting. It also has the Certification Official Swiss Chronometre (COSC) rating. It’s water resistant to 100 meters/330 feet, and the 12mm thick case, dial, and movement are all signed.
This Rolex Cosmograph Daytona 116515LN has a mechanical automatic self-winding Rolex caliber 4130 movement that’s rhodium-plated, with oeil-de-perdrix embellishment. It’s constructed with 31 jewels, a straight-line lever escapement, and a paramagnetic blue Parachrom hairspring oscillator. It includes a monometallic balance adjusted to 6 positions, and a shock absorber mechanism. It has a self-compensating free-sprung Breguet balance spring, Microstella regulating screws, and a hacking seconds device. The mechanism oscillates at a frequency of 28,800 vph (4 Hz).
The Rolex Cosmograph Daytona 116515LN was introduced in the 2000’s.