ROLEX REF 6238 PRE-DAYTONA CHRONOGRAPH BLACK DIAL STEEL
Rolex, "Chronograph," case No. 1105891, Ref. 6238. Made in 1965.
Very fine and very rare, water-resistant, stainless steel wristwatch with round button
chronograph, registers, tachometer and a stainless steel Rolex buckle.
Three-body, polished and brushed, curved lugs, inclined bezel, screwed-down
case back.
Black with applied steel baton indexes and luminous dots, subsidiary dials for
the seconds, the 12-hour and 30-minute registers, outer 1/5th seconds track and
tachometer scale to 1000 UPH. Luminous steel baton hands.
Cal. 72B , rhodium-plated, 17 jewels, straight-line lever escapement, monometallic
balance adjusted to three positions, shock absorber, self-compensating
Breguet balance spring, Microstella regulating screws.