In 1956, Rolex SUBMARINERS launched 6536 and 6538, can be found with the A296 and the new caliber caliber 1030 (the first bi-directional rotor winding Rolex).

The first edition of 6538 still have a rounded back BUBBLEPACK the type of case, which also inherited the caliber, and a fine of cases early models.

The second version of 6538, that is, its more 8 mm and the winding up of the new caliber crown in 1030.

Rolex in the spare parts catalog, this model is called 6538A.

Triangular panels can be red, for the English 6200, the greatest depth of restrictions compared to six hundred and sixty feet 330 feet in 6536, while retaining its original situation.

Model 1030 caliber has its own reference: 6536-1. In 1030 through the opening of a higher caliber of accuracy and from the end of 1958, we began to see the 6538s to carry the official certification of registered dial-up chronometer.

These models usually have the time and wrote an inscription for gold, with depth indicators and astronomical white. They are still in production throughout 1956.