The line of perpetual calendar chronograph wristwatches is one of the cornerstones of Patek Philippe’s collection. It all began in 1940 with the introduction of ref. 1518; since then, the line has continuously been in production until now, spawning five main references. It is however only in recent times, with the introduction of ref. 5004 in 1996 that a split-second feature was added to the ensemble.

Launched in 2012, the ref. 5204 replaced the ref. 5004 being the first perpetual calendar chronograph wristwatch to feature the manufacturer’s first in-house cal. CHR 29-535 PS Q, replacing its former Lemania based cal. CHR 27-70Q. The addition of a split-seconds feature propels the watch into the ultimate echelon of watchmaking, the split-seconds chronograph being one of the most daunting complications to execute, together with the minute repeater. Such mechanical prowess coupled with the generous proportions of the watch and the quintessentially Patek Philippe design of the model made ref. 5204 an instant classic, highly coveted by collectors.

Cased in platinum and displaying a striking black dial, not only is the present example fresh-to-the-market from the original owner, it is further preserved in virtually unworn condition and is accompanied by all its original accessories.