From 1947 until 1962, Rolex produced a series of rare and innovative triple calendar chronograph wristwatches housed in Oyster cases, encompassing the references 4767, 5036, 6036 and 6236. The reference 4768 also bore a triple calendar chronograph complication, however in a non-Oyster case. Produced in very limited numbers, these references were made in yellow and pink gold, as well as stainless steel. Initially known as the Dato-Compax, today they are more generally referred to as the "Jean-Claude Killy", named after the three-time French Olympic ski champion and Rolex ambassador. After production of reference 6236 ceased around 1962, Rolex would never again offer a model with similar complications.

By studying the different models, one can immediately denote an effort on the part of Rolex toward the simplification and optimization of both case and dial architecture. The two earliest references were produced at the same time: non-Oyster reference 4768 (the only non-waterproof Dato-Compax) and Oyster ref. 4767. They present dials with very vintage traits including two-tone dials, especially in the earliest examples, and 5-minute Arabic divisions in the seconds scale. The date ring presents “upside down” numerals in the lower half of the dial: there is no inversion of graphic direction at 9 and 3 o’clock. The two-tone effect of these dials is usually more subtle. The date ring begins to present the inversion at 9 and 3, so the numbers on the lower half of the ring read vertically. Its successor reference 6036 features a more simplified seconds scale, lacking the Arabic 5-minute division, however the numbers 6 and 9 are left open ended.

The present, early reference 6036 bears a charismatically aged dial, resembling ivory parchment that has turned a beautiful beige hue over time. This change in color contrasts wonderfully with the still vividly blue outer date track and the stainless steel case. The dial’s wonderful, recessed small, silver-finished square hour markers, coronet, ‘12’, and wide “SWISS”-only designation, are correct for the reference and era. It features a bright blued steel calendar hand to complement the blue outer calendar track typical for this reference. Its case is remarkably well-preserved, thick and still sharp, indicating it was worn carefully over its lifetime. This is an exceptional opportunity for the astute collector to gain a renowned and hallowed reference, the most complex chronograph wristwatch ever produced by Rolex.