With Rolex original Guarantee and green card holder.
The present watch is a beautiful example of reference 16520 featuring caliber 4030 based on a Zenith ebauche. It is characterized by what is called among collectors a "floating dial" and a bezel calibrated to 200 units. Additional elements of its identity are smaller details such as "inverted" 6 on the chronograph 12-hour counter and the four dashes within the five minute division on the minute counter, when later examples featured only three. The experienced collector will also notice the red tipped chronograph hand.
A "floating dial" will show the designation "Cosmograph" with a marked distance from the previous "Superlative Chronometer" and "Officially Certified" lines. In later dial versions the designation Cosmograph is found immediately below the other descriptive lines. In conjunction with its floating dial, this early version reference 16520 boasts the correct version of the tachometer scale calibrated to 200 units and not the 400 units found in subsequent versions.