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its not the manual, but this might help: the three button chronograph would be brought together in the form of
the 5034. During the next fifteen years the 5034 changed into the 6034,
which then became the 6234. This in turn became the 6238 and then
finally evolved into the 6239. These changes although little by little
had inspired Rolex to revive the previously shelved name the
"Cosmograph". The only difference between the 6239 and the 6238 was
that on the 6239 the bezel was engraved with tachymeter graduations
rather than having them on the dial. The last major changes to the
manual wind chronograph came in the late 1970's when Rolex introduced
the 6263 model. This was the first model to have truly waterproof
pushers. The earlier Oyster Chronographs had simple round pushers with
internal gaskets as the only sealing mechanism. The screw down pushers
were added to stop people pressing the buttons, whilst submerged in
water. The locking function also prevented the chronograph being
activated inadvertently. The new 6263 started life as being waterproof
to 165 feet, ten years later it was capable of twice that depth (100
meters) The 6263 is unusual in the fact that the quality of the
movement depended on which case you had. The steel chronograph
movements were not timed to a chronometer standard. Despite the
innovative design it was not until 1986 when the popularity of the
Daytona started to increase, reaching its zenith with a particular
Daytona model, the "Paul Newman". This model featured square markers on
the subsidiary dials, and an outer track the same colour as the
If you bought it at a market it is a fake watch, made in Far East country. People who can afford to buy Rolex watch will NEVER sell it at a market. All you can do is to find your nearest watch repair shop and ask at least to restart it. Do not expect even average timekeeping. The function buttons probably will not work as well. Sell it, if you can and never buy watch at a market again.
this may help. unscrew both buttons. push in top button to start.again to stop.bottom is to reset. coincidently large sweep second hand is used for chrono and not the smaller register. the other registers are 24 hr military time and chrono minutes.