ROLEX REF. 6239 COSMOGRAPH DAYTONA
DOUBLE SWISS STEEL
Rolex "Cosmograph", case No.923449, Ref. 6239. Made circa 1962.
Very fine and rare, water-resistant, stainless steel wristwatch with
round button chronograph, registers, tachometer, steel bezel
graduated to 300 UPH and a stainless steel 71 Rolex Oyster bracelet
with deployant clasp.
Three-body, polished and brushed, curved lugs, tachometer on the
bezel graduated to 300 units per hour, screwed down case back.
Bicolor silver and brown with applied faceted steel baton indexes
and luminous dots, outer minutes/seconds divisions, subsidiary black
guilloche dials for the seconds, the 12-hour and 30-minute registers.
Luminous steel baton hands.
Cal. 72B, rhodium-plated, 17 jewels, straight-line lever escapement,
monometallic balance adjusted to 3 positions, shock absorber,
self-compensating free- sprung Breguet balance spring, Microstella
regulating screws.