PATEK PHILIPPE | REFERENCE 5204 A PINK GOLD PERPETUAL CALENDAR SPLIT SECONDS CHRONOGRAPH WRISTWATCH WITH MOON PHASES, LEAP YEAR AND DAY AND NIGHT INDICATION, CIRCA 2016 | 百達翡麗 | "型號5204 粉紅金萬年曆追針計時腕錶，備月相、閏年及晝夜顯示，機芯編號5252628，錶殼編號6121613，約2016年製"

Launched in 2012, the reference 5204 is the successor of the reference 5004, both exhibiting a perpetual calendar and split seconds chronograph. Comparing these two references together, one can easily recognize the inspiration of reference 5004 on reference 5204, but with the latter displaying a handful of upgrades while conveying its own merits. In order to house the 29 mm movement CHR 29-535 PS Q, reference 5204 expands the case to 40 mm in diameter, significantly increasing its presence but still retaining the traditional look. This in-house movement features a double column wheel design with a horizontal clutch, increasing the stability of the watch while reducing the thickness. The leap year and 24 hours indication are condensed into apertures on the dial, with the numerals appearing to be baton indexes, reducing complexity to give the watch a cleaner presentation. Perhaps the most distinguishable icon of the reference is its inverted moon phase, making it rather charming and aesthetically pleasing.