Finding any Patek Philippe reference 5004 is a rare event. Finding one in new old stock condition is rarer still. This 2008 example, crafted in 18-carat white gold with a silver dial, has been preserved essentially as it left the manufacture, offering collectors the closest possible experience to acquiring one of the most complicated and slowly produced Patek Philippe watches of the modern era when it was new. Combining a perpetual calendar, a moon phase, and a split-seconds chronograph, the 5004 holds a special place in the manufacture's history as its first serially produced split-seconds perpetual calendar chronograph. The 5004 belongs to one of the most distinguished lineages in watchmaking. Patek Philippe introduced the world's first serially produced perpetual calendar chronograph wristwatch, the reference 1518, in 1941, and followed it with the celebrated references 2499 and 3970, each a landmark in its own right. When the 5004 arrived in 1994, it built directly on the design of the 3970 while adding a split-seconds mechanism, or rattrapante, raising the level of complication considerably. It remained in production until around 2010, and throughout its run it was made at a deliberately slow pace because of the complexity of its movement and the high standard of its finishing. The split-seconds function is the heart of the watch. Two central chronograph seconds hands, stacked one above the other, start together when the chronograph is engaged. A press of the pusher integrated into the crown stops one hand while the other continues to run, so the wearer can read an intermediate time, such as a lap or a second competitor's finish, without stopping the overall measurement. Another press sends the stopped hand leaping forward to catch up with its partner. It is one of the most delicate mechanisms in watchmaking, and pairing it with a perpetual calendar is a demonstration of Patek Philippe's mastery at the very highest level. The silver dial balances an extraordinary amount of information with remarkable calm. Large applied white gold Arabic numerals give the 5004 a bolder, more legible character than the baton-marked 3970, while a railway minute track and outer seconds scale frame the dial for precise timing. Beneath twelve, the day and month appear in twin apertures, here in English. On the left, a subdial combines the running seconds with a 24-hour indication that helps the wearer distinguish day from night when setting the calendar. On the right, the 30-minute chronograph counter shares its subdial with the leap-year cycle. At six o'clock, the date is read around the edge of a subdial framing the moon phase, where the moon glides across a deep blue sky. Slender hands complete a composition that is both technical and elegant. The perpetual calendar keeps track of every month's length and of the leap-year cycle automatically, and it will not need adjustment until the year 2100, when the Gregorian calendar skips a leap year. The moon phase advances continuously with the lunar cycle. Together with the split-seconds chronograph, the watch measures time on every scale from fractions of a second to the phases of the moon, an achievement that captures the ambition of Patek Philippe's grand complications. Powering the watch is the manually wound Calibre CH 27-70 Q, built on the Nouvelle Lemania chronograph architecture that Patek Philippe refined and finished to its own exacting standards, with a split-seconds module and perpetual calendar mechanism added. The movement uses 28 jewels. The 5004 was among the last Patek Philippe references to use this Lemania-based calibre, together with the references 5070 and 5970, before the manufacture moved to its own in-house chronograph movements. Winding the watch by hand connects the wearer directly to the mechanism, a fitting ritual for a watch of such technical depth. The white gold case measures approximately 37 mm in diameter and is slightly larger and thicker than the 3970 to accommodate the split-seconds module. Its stepped bezel, sculpted lugs, and round chronograph pushers at two and four o'clock give it a classic, refined profile, while the split-seconds pusher sits discreetly within the crown. White gold lends the case a cool, understated luster that suits the silver dial, and the watch is worn on a rich brown alligator strap that adds warmth to the overall composition. Part of the 5004's enduring appeal lies in how it balances complexity with restraint. Despite housing three major complications, it never feels crowded or ostentatious on the wrist. Its proportions remain classic, its dial reads with clarity, and its white gold case keeps a quiet, understated presence that suits a tailored suit as naturally as a more relaxed outfit. Collectors often describe the 5004 as the purest expression of the perpetual calendar chronograph tradition at Patek Philippe, a watch that took the formula perfected by the 1518, 2499, and 3970 and added one more layer of mechanical mastery without disturbing its harmony. That combination of depth and discretion is precisely what has made the reference so revered. New old stock condition is what makes this particular example so exceptional. Grand complications are typically worn, serviced, and gradually altered over the years, so a 5004 that has been preserved as it left the manufacture is extraordinarily scarce. Combined with the rarity of the reference itself, produced in very limited numbers across yellow gold, rose gold, white gold, platinum, and a final series in steel, and with white gold considered among the rarest metals of the entire production, this watch represents a remarkable opportunity for the serious collector. What makes this 2008 Patek Philippe 5004G so compelling is the meeting of historical importance, technical mastery, and condition. It is Patek Philippe's first serially produced split-seconds perpetual calendar chronograph, it was made in remarkably small numbers, and this example has been preserved in new old stock condition in white gold. For collectors of grand complications, it is one of the most desirable modern Patek Philippe watches imaginable.