ROLEX REF. 16520 ZENITH
DAYTONA MARK III INVERTED 6
Rolex, Oyster Perpetual, Superlative Chronometer, Officially
Certified Cosmograph Daytona, case No. T800669, Ref. 16520. Made
Fine, self-winding, water resistant to 100 m, stainless steel
wristwatch with round button chronograph, registers, tachometer
and a stainless steel Rolex Oyster bracelet Ref. 78390.
Three-body, solid, 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.
White with applied luminous white gold baton indexes, outer
1/5th seconds track, subsidiary dials for the seconds, the 12-hour
and 30-minute registers. Luminous 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.