First, the production, until 1962, only a modified version of the 6538. Rolex watches with this caliber 1500 (mentioned in the introduction of more modern production balance wheel Stratford, freedom of the spring and adjustment screw, to be more precise in 1030).

The “astronomical” certified watch for a new inscription, “the official chronometer certification unparalleled.”

You can find caliber in 1530 or 5510 and 1520 (as distinct from the other only by a number of changes per hour: 18000 and 19800) dial-up with the inscription of gold, usually the biggest indicator of the depth, not interchangeable with other models with a panel triangle network 8mm and winding-up crown.

This model can be seen as a prototype, a bit like 6240′s Cosmograph nailed on the button.

In 5508 have the same penalty as the 6536s case, from its fall.

This was launched in 1030 caliber, and then equipped with high-quality production ended in 1530 until 1962.

You can find its inscription and targets, or gold or white.

Like all crew checks to the present, it has a 6 mm. Winding no protection around the crown, and fine milling than today’s models.

These models have been known as the 007, even if the beginning, collectors only mentioned the name of the 6538