Rolex Oyster Perpetual Cosmograph Daytona "Zenith El Primero" Champagne Dial With Diamond Markers 18K Yellow Gold Ref. 16528

DETAILS

Manufacturer: Rolex
Model: Oyster Perpetual Cosmograph Daytona Zenith El Primero
Reference Number: 16528
Movement: Automatic
Condition: Very good (some signs of tarnish due to age, can be cleaned with polishing)
Gender: Men’s/unisex
Time Period: 1990
Retail / Compare-At Price: n/a collector's item
Our Best Price: $32,250

CALIBER
Movement: -
Caliber: 4030
Jewels: 31 

CASE
Case Material: 18K yellow gold
Case Diameter: 40 mm
Thickness: 13 mm
Waterproof: 100 ft. / 30 m.
Water Resistance: 3 ATM
Material Bezel: Fixed 18K yellow gold engraved Cosmograph Tachymeter scale
Glass: Sapphire crystal
Dial: Factory Champagne diamond stick dial with black outer sub-dial rings 
Dial Numerals: 18K yellow gold applied baton with luminescent dart hour indices, railway track minutes/second scale  around the outer rim

BRACELET / STRAP
Bracelet color: 18K yellow gold
Bracelet Material: Integral 18k yellow gold Oyster
Clasp: Double folding
Clasp material: 18K yellow gold

FUNCTIONS
Center hour, minute and seconds hands, chronograph (center hand) accurate to within 1/8 of a second, chronograph sub-dials counters 60-second at 9 o'clock, 30-minute at 3 o’clock and 12-hour at 6 o’clock, Tachymeter counter on the bezel, 72-hour power reserve

OTHERS
Tonneau-shaped case
18K yellow gold and luminescent baton hands, yellow gold applied stick center sweep seconds hand
Double down, brushed case back, screw-down chronograph push buttons, stop-seconds for precise time setting
18K yellow gold solid screw-down, brushed case back, screw-down chronograph push buttons, and a Triplock winding-crown with a Rolex crown engraved protected by the crown guard
Solid three-body case, curved lugs, and flat angled bezel with tachometer graduation to 400 UPH, are polished/brushed
The ref. 16528 has a mechanical automatic self-winding Zenith El Primero caliber 4030 (Zenith base 400) 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.
This mechanism oscillates at a frequency of 28,800 vph (4 Hz).
Introduced in 1963 as a sports companion for professional race car drivers, the Daytona comes equipped with a Tachymeter bezel that can be used alongside the sub-dials to calculate the speeds of up to 400 kilometers per hour. 
Serial # E322***
Incomplete ( box, no papers)