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. Marking a new era for Patek Philippe perpetual calendar chronographs, the ref. 5204 featured certain upgrades such as an enlarged 40mm diameter case, baton numerals replacing its former applied gold Arabic numerals featured on the ref. 5004, a slight tweak in the layout of the dial with a noticeable “upside down” moonphase resembling a “smile”. The reference was released first in platinum with an opaline silver dial and two years later, the black dial was launched and the pink gold variants came later.

Fresh-to-the-market and offered by the original owner, the present example Patek Philippe ref. 5204P fitted with a black dial and is offered in single-sealed condition and accompanied by the full set of accessories. Being the first reference to feature Patek Philippe’s first in-house caliber, the 5204 is with no doubt a milestone piece of perhaps the most important line of complicated timepieces by the firm.