In 1965, the first nail button model production, and continued until 1969 production of 722 movement.

This watch is a Rolex mysterious objects in a limited period of time, only a few appear in the directory of the time.

Some theories have been proposed to introduce these screw button:

Seems to be the most conclusive prevent accidental start time function in high-risk situations (diving, there is dust or other aggressive material). The first time, the inscription on the emergence of a dial-up of the 6240 oysters, previously described only in 6238 and pump timer button.

Eligible oysters, ensuring the improvement of water resistance is due to the existence of spiral button and a 7 mm winding up from the 700 Series crown, rather than install a 600 series pump is equipped with six millimeters examples button.

This model can be with the main black Bakelite panel, but it is likely to have the first example Rolex (1965-1967) and the metal panel 6239, as the first standard model Bakelite panel 6241 that remain in production 67 to 70 years are the same in various ways to the 6239, apart from the panel.

Movement contrary to the three models in the second half of the 60 (including 6239) are still on the 722 from Article 72B from its retained the same number of changes per hour – 18000.

Back to 6240, should be borne in mind the example of steel dark dial-up, the earliest, with silver counters, as well as those light-colored with a brown dial counters.

This model may have a considerable length of time, but a limited number, such as Rolex does not expect a good market response.

According to official retailers, many customers do not buy COSMOGRAPHS, for the following reasons:

They fear damage to their shirts with the large size of the button out.

They believe that greater observation, became unattractive.

In their view, a different dial-up too much time for other production.

70s in the last century began, other mysterious objects arrived in the market, unique reference number, 6262, only in 1970 and 6264, production for 70 years to 1972.

The first time in 6241 and 6239 panel second panel, but always and specialized nailed button.

The two reference caliber introduced a new 727 with the turn of 19,800 per hour, more carefully produced and 72B/722 accurate than previous models.

1970 at the same time they appear on the market a large number of references that Rolex has not yet decided to go or classic nail in the button.

On this issue mentioned in 6262 and 6264, but must remember that these models can also be seen in the steel with a black surface, there are signs and inscriptions in silver, in addition to the word Daytona, this is still the pearl gray in Matt.

All of these formulations was a bit confusing for today’s collectors, as the reference number of forms and under different circumstances to return to about 50% of the COSMOGRAPHS are still in circulation.

These differences may be:

Completely back to the original case marked with the initials, such as the CRS (Rolex manufacturer / supplier of identity) and other inscriptions on the standards, but which does not include the reference model.

Case back to double-reference (1 written on the other, and to erase the classic horizontal line 3 or 4)

Deported to different outside the scope of a significant case, detailed above.

It can be assumed that in watching the General Assembly, Cosmograph cases to support the identification procedure is as follows:

• General Assembly to return to the same case with a number of circumstances.

• If you do not have, but different with the remainder of the General Assembly, that is different from the reference, but to bring the same type of panels (such as the 6239 and 6262 cases, the situation in 6263 or 6241, etc.).

• Where do not have:

1 overlapping numbers (such as 6264 and 6263 cases of written 6263)

2, the case back to the General Assembly Anonymous

3, the General Assembly of any other case, the back

The so-called “false” cases of setbacks is always linked to the logic of production.

Only good reason to be concerned about the domain of the original case, you can always be known as Rolex dealer if there is any doubt.

In reviewing the pattern of nails in the button, it may be an appropriate opportunity to mention Paul Newman.