Rolex 16520 Daytona SS Black Dial Zenith Movement U Series (28731)

28731 Rolex 16520 Daytona Zenith Movement, stainless steel on a stainless steel 78390A bracelet with SEL end links, the case appears to be unpolished, automatic Zenith El Primero movement, black dial, chronograph subdials have a beautiful creamy patina, 12 hour chronograph, sapphire crystal, water resistant to 100 meters, size: 40 mm, thickness: 12.5mm, U series (1997), Excellent condition with European Watch Company Travel Pouch and 1 Year Warranty.

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More about Rolex 16520 Daytona SS Black Dial Zenith Movement U Series

This is a stainless steel Rolex Daytona Cosmograph Daytona 16520. It has an integral stainless steel bracelet with a double deployment clasp, and a scratch resistant sapphire crystal. There is a Triplock winding crown protected by shoulder crown guards, and there are screw-down round chronograph pushbuttons. It has a screw-down solid case back, and the 40mm diameter solid three-body case, integral lugs, link bracelet, and wide fixed bezel with a tachymeter scale to 400 UPH are polished/brushed. The dial is black with gold-rimmed subsidiary dials. It has applied luminous "boat" baton white gold hour index markers, luminous white gold baton hands, and a center sweep chronograph hand with an arrow pointer. Around the perimeter is a minute/one-fifth seconds track. There are three subsidiary dials, including a running seconds register at 9 o'clock, a 12-hour totalizer at 6 o'clock, and there is a 30-minute totalizer at 3 o'clock. It has a Certified Official Superlative Chronometer rating, and it's water resistant to 100 meters/330 feet.

This Rolex Daytona Cosmograph Daytona 16520 has a 1999 automatic self-winding Zenith El Primero caliber 4030 movement. It's rhodium-plated, with oeil-de-perdrix embellishment. It's constructed with 31 jewels, a blue Parachrom hairspring, an Incabloc shock absorber device, and a straight-line lever escapement. It includes a monometallic balance that's adjusted to temperatures and 5 positions, a self-compensating free-sprung Breguet balance spring, and Microstella regulating screws. The mechanism oscillates at a frequency of 36,000 vph (5Hz).