In 1969, Rolex introduced references 6263 and 6265, succeeding the first Oyster Cosmograph, reference 6240. Both models featured screw-down Oyster chronograph pushers, improving water resistance to 50 meters. Notably, the 6263 came equipped with a black acrylic bezel insert with a white tachymeter scale—a signature detail that enhanced both function and design.

These references remained in production for nearly two decades and were available in stainless steel or gold, offering versatility to collectors and enthusiasts alike.

What sets the present reference 6263 apart are several subtle but important features. Most striking is the dial, likely part of a series of experimental or test dials, with sub-registers that are visibly larger than usual. This rare and collectible variation has earned the nickname “Big Eye” among Daytona collectors. This is especially visible as the "T Swiss T" signature is much closer to the bottom subsidiary register than normal examples.

Another distinguishing detail is the lower placement of the “Rolex Oyster Cosmograph” text on the dial. Combined with its sharp condition and distinctive appearance, this timepiece is a standout example sure to appeal to discerning collectors.