Signed Rolex, Oyster, Cosmograph, Ref. 6265, Case No. 4'138'226, Circa 1975

A true Oyster case is defined by the screw-down case back, screw-down crown and screw-down chronograph pushers, thus ensuring increased water resistance. Reference 6265 is indeed one of these highly sought-after models. Together with its sister reference 6263 (the difference being the black-insert bezel rather than the metal one), the reference 6265 is the final evolution of manually wound Daytonas. It is defined, beyond its metal insert and screw-down pushers, by the caliber 727 (evolved from caliber 722-1).

One will notice the highly attractive "tropical' registers. Over time, the subsidiary dials have changed from black to a dark brown color, the result of the dial aging in its own unique way. It is an exceptionally charismatic example with the registers now a “tropical” shade that perfectly complements the silver sunburst dial.

The present reference 6265 features a dial that is known as a "Sigma" dial, indicated by two small Sigma symbols on either side of the "T Swiss T". The Sigma symbols indicate that the baton numerals and hands on a dial are made of gold, in this case white gold. Sigma dials were first seen on the reference 6240, and were nicknamed "Goute A Prior" by Italian collectors and originally referred to the union of three Rolex dial producers: Singer, Stern, and Beyeler. On later references, the Sigma came to refer to indices and hands in gold.