Year Introduced: 1960
First Model: 6239
First Movement: 72B (Valjoux)
(Early models) Gents
Case Size: 37mm
Lug Size: 20mm
Case Size: 40mm
Lug Size: 20mm
Chronograph: From the Greek words “chrons” and “graphis” which means “writing of time”. A chronograph is a timepiece that, in addition to the normal time telling function, also performs a separate time measuring function such as a stop watch—with a separate seconds hand which can be started, stopped and reset to zero, via push-buttons on the side of the case.
Rolex released their first chronograph wristwatch around 1937. However, rather than designing the movement themselves, they decided to import movements from Valjoux—which proved useful for nearly 50 years. These “Anti-Magnetic” watches saw numerous styles with varying degrees of success.
In 1960, Rolex resurrected the faltering chronograph line
with the introduction of the Cosmograph (model 6239). While a Cosmograph is in fact a chronograph by definition, the name “Cosmograph” was a creation of Rolex. The cosmetic difference being that a Cosmograph has the tachymeter scale engraved on the bezel, whereas chronograph models
were printed on the dial. The watch was powered by a Vaijoux 72B movement, but was subsequently replaced with the 722/1. It is worth noting that these earliest Cosmograph versions had the tachyrneter
scale calibrated to 300 units per hour, but within a year was
changed to only 200 units per hour. Tn 1961, Rolex released a second version (model 6241),
which like the 6239, was powered by the 72B movement. The difference between these two models was cosmetic, in Daytona Cosmograph (model 6239) with exotic Paul Newman’ dial. Circa 1960s that the 6239 featured a solid steel bezel, but the 6241 had a steel ring fitted with a clear acrylic insert.
These watches soon became known as the Daytona, so named after Daytona Beach, Florida, which is home to some of the biggest names in auto racing. The watches were very popular in the racing community, due to their usefulness when calculating average lap speed.
(P/ease Note: The names “Cosniograph” and “Daytona” were not present on a/i dial through the
years. Furthermore, examples have been seen with these names in cflfferent positions on the dial: below
the name “Rolex”, which is below the ‘12’position, as In this picture Paul Newman is seen wearing well as above the bottom register, in an arc fashion. the watch he made famous: the Rolex Day- This inconsistency has caused confusion over the tona, with the exotic (contrasting register) dial. years, with many collectors questioning the authenticity
of their watches.)
From the start, the watches were available in two dials; the standard dials were either black (with silver registers), or silver (with black registers); and the exotic dials which were either black (with white registers), or cream white (with black registers). These exotic dials soon became simply known as the “Paul Newman”, after he reportedly wore one in the racing film “Winning”. Legend has it that Mr. Newman’s picture (with the watch visible on his wrist) appeared on Italian movie posters to promote the film. Mr. Newman then subsequently appeared on the cover of a popular Italian magazine, thus sparking a love affair with the watch that has lasted over 30-years.42 After studying the film I can say that Mr. Newman does indeed wear a “stainless steel” watch in nearly every scene, however, the watch is never shown clear enough to positively identify the model. Furthermore, the face of the watch appears
to be silver in color and the trademark contrasting registers are not identifiable. With that being said, I will offer another possible explanation. The 6239 was also available with an optional exotic silver dial featuring all silver registers. I believe this was the Daytona model worn in the film, with Mr.
Newman subsequently donning the exotic (contrasting register) Daytona on the cover of theaforementioned Italian magazinc. 1 must stress that there is no hard evidence to support this and at this point it is purely speculation and conjecture. While all versions of the Daytona with contrasting registers _____ have subsequently become known as Paul Newmans, some would argue that the only true Paul Newman models are described as follows: The 6239 and 6241 case numbers, manual Daytona Cosmograph (model 6263) with wind, steel cases, with the two aforementioned ‘exotic dial’ exotic dial. Circa 1970s configurations—featuring square markers within the registers.
In 1965, the 6239 was replaced by the 6262, and the 6241
by the 6264, respectively. Both watches featured a new Valfoux 727 movement. Also in 1965, Rolex released a new watch to the line (model 6240). This was the first model to feature screw-down waterproof pushers and the name “Oyster” on the dial, thus it was now rated waterproof to 165 feet (50 meters).
In 1971, the 6264 was replaced by the 6265, and the 6262 by the 6263, respectively. Both new models now featured the new screw-down waterproof pushers, which were introduced
on the 6240. These two models were also the first Cosmographs to receive the new larger Triplock winding crown. Both models continued in the Rolex catalog until being discontinued
in 1987. In 1988, Rolex released the new Oyster Perpetual Cosmo graph Daytona (model 16520), which were powered by a modified Zenith El Primero movement (Cal. 4030). While the 16520 was stainless steel, it was also available in two- toned (stainless steel & l8kt yellow gold), as well as solid
l8kt yellow gold models, as the 16523 and 16528, respectively. The first versions were calibrated to a 200 units per hour scale, but were subsequently upped to 400 units per hour, as they are today. In 1992, Rolex released a new Oyster Perpetual Cosmograph Daytona (model 16518), which was only available Daytona Cosmograph (model 116518) in 1 8kt yellow gold, with a leather strap and safety deploy- with exotic dial. Circa 2002. ment clasp. The bezel featured small triangles pointing to the individual calibrated numbers, rather than the small dots present on earlier models. By 1997, Rolex finally released a white gold version of this watch as model 16519. In 2000, Rolex updated the Daytona line once again, with the introduction of the first “in-house” Daytona movement (Cal. 4130), which features a 72 hour power reserve—or 66 hours when the stopwatch function is used. This new model was also fitted with a special proprietary deployant clasp. It was also at this time that Rolex fitted the Daytona with a new 6-digit model number.
Basic Operation of the Tachyineter Bezel Scale
The Rolex Cosmograph “Daytona” is basically a chronograph (stop watch) with the aid of a Tachymeter (logarithmic) scale printed around the bezel. The screw down push-buttons (located on either side of the winding crown) are used to start, stop and reset the timer. The Tachymetcr scale allows the wearer to calculate two basic timed functions when used in conjunction with the stop watch. These functions are to Measuring Elapsed Time & Calculating Average Speed, and their explanation is as follows:
Measuring Elapsed Time:
To perform this function you will need to unscrew the push-buttons, so they are in the operational position. By pressing the upper button, the large sweep second hand starts the timing sequence (to within 1/5 of a second), while two mini-rcgisters on the dial record the elapsed hours and minutes respectively. (Please Note: The third mini-register constantly measures scconds and is not part of the stop watch function.) Press the upper button again and the timing sequence is stopped. Pressing thc lower button will reset the large sweep second hand and both mini-registers to zero.
Calculating Average Speed:
This function is performed similarly to Measuring Elapsed
Time, but you are measuring the time it takes to travel a predetermined
distance (such as a mile or kilometer). The only requirement
is that the total measured time must fall between 9 seconds to
60 seconds, which is calibrated within the scale 60 to 400 units per
hour. Please Note: Earlier chronographs featured 1000, 200 and
300 unit per hour scales, respectively.
If you were timing a car as it travels around a one mile track,
then you would press the upper button to start the timing sequence,
then press the upper button again when the ear has completed the
distance—in this case one lap around the track. Once a time has
been established, then you would simply read the Taehymeter Cosmograph ‘Daytona’
scale as it corresponds to the time. For instance, if it took 30 see- with Tachymeter scale bezel. onds for the ear to travel one mile, then the corresponding number
on the Tachymeter scale would be 120. Therefore, the car maintained
an Average Speed of 120 mph.
If you are unable to keep the timed sequence between 9 seconds to 60 seconds, then you can use a different distance and perform a simple calculation. If it took 40 seconds for a bicycle to travel ½ kilometer, then the corresponding number on the Tachymeter scale would be 90. However, since it only traveled V2 kilometer, then the Average Speed would be ‘/2 as well which is 45 kmlhour.
Now lets say you are measuring the speed of an airplane which traveled 10 miles in 45 seconds. The corresponding number on the Tachymeter scale would be 80. Since the airplane traveled 10 miles, then the Average Speed would be 80 mph xlO which is 800 mph.
Information found from “The Rolex Report”, revised and expanded 4th edition by John E. Brozek.