ROLEX REF. 16520 DAYTONA COLOR CHANGE DIAL STEEL
Rolex, Oyster Perpetual, Superlative Chronometer, Officially
Certified Cosmograph Daytona, case No. U329471, Ref. 16520. Made
Fine self-winding, water resistant to 100 m, stainless steel
wristwatch with color change dial, round button chronograph,
registers, tachometer and a stainless steel Rolex Oysterlock bracelet
Ref. 78390. Accompanied by the original fitted box, guarantee (now
void) and booklet.
Three-body, polished and brushed, screwed-down case back,
buttons and crown, Triplock winding-crown protected by the
crown guard, tachometer graduation on the bezel to 400 units per
hour, sapphire crystal.
Black with applied luminous white gold baton indexes, outer
1/5th seconds track, subsidiary dials for the seconds, the 12-hour
and 30-minute registers. White gold bâton hands.
Cal. 4030, rhodium-plated, 31 jewels, straight-line lever escapement,
monometallic balance adjusted to temperatures and 5
positions, shock absorber, self-compensating free-sprung Breguet
balance spring, Microstella regulating screws.