A world time complication on a 36 mm case with a diamond bezel and a hand-guilloched olive green dial is not a combination Patek Philippe has offered often, and it is the reason this reference stands apart from the rest of the collection. World time is one of the house's signature complications and it is almost always built at larger diameters with a plain bezel, because the display needs room and the watch is understood as a technical piece. This version keeps the full complication, reduces the case, sets the bezel with diamonds and lays the whole thing over an olive green dial worked with an old-basket weave motif by hand. The version designation is world time. It is no longer part of the current collection.
The case is 36 mm in rose gold with a bezel set with diamonds, and 36 mm is genuinely small for a world time watch, which makes the dial layout the achievement here rather than the case. The dial is olive green and hand-guilloched with an old-basket weave motif, and the two words that matter in that description are hand and motif. Guilloche is a pattern cut into the metal of the dial rather than printed or stamped onto it, so the texture is physical and changes appearance completely with the angle of the light, going from near-flat to strongly three-dimensional as the wrist moves. The old-basket weave is a dense interlocking pattern rather than a radial or wave figure, which means it holds together visually even at the small scale this case imposes. Olive green over a cut texture is an unusual choice and a deliberate one, because green is a colour that can easily look flat and the guilloche prevents that outcome entirely. Hour markers are applied rose gold, matching the case and standing clear of the textured field, and the watch is worn on a calf leather strap. The strap is softer and less formal than alligator, which suits a watch that is decorative as well as technical. The lugs are short relative to the case, which is what lets a 36 mm world time watch sit correctly on a wrist that would normally be sized well below it. Guilloche also carries a consequence that is easy to overlook. Because the pattern is cut into the dial rather than applied to it, the depth of the cut is fixed at the moment of manufacture and cannot be corrected afterwards, so dials of this kind are rejected at a higher rate than printed or stamped ones. That is a real constraint on how many can be made in any given colour.
The complication is world time. The display shows the hours in cities across the world simultaneously, with a rotating arrangement that lets the wearer read any of them without calculation, and it is one of the few complications that is genuinely useful rather than principally interesting. Setting it is a single operation and the local time changes with it. The complication has a long association with this house specifically, and among collectors it is one of the displays most closely identified with Patek Philippe rather than with watchmaking generally. Winding is automatic. What world time asks for is dial space, which is why the reduction to 36 mm here is the interesting part of the reference, and the compromise is that the city ring and the hour ring are rendered small enough to require attention rather than a glance. That is a real trade and worth understanding before buying. What the watch gives back is a complication that most wrists this size are never offered at all.
Within the Complications collection the 7130 line is where world time is built for a smaller wrist, and it is the counterpart to the larger world time references that the collection has produced continuously for decades. Those larger references are read as travel watches. This one is read as a piece of jewellery that happens to carry a serious complication, and the difference in intent shows up in every decision on the watch, from the gem-set bezel to the choice of a coloured guilloched dial rather than a plain one. The dial treatments are what separate examples within the line, since the case and complication have remained constant, and Patek Philippe has used this reference to explore colours it does not usually put on a complicated watch. Olive green sits at the more adventurous end of that range. The collection's other reduced-size complications, the 4948 annual calendar among them, occupy the same territory, but world time is the more difficult complication to shrink and the more distinctly associated with the house. The reduction in size also changes who the watch is for in a way the specification does not convey. A world time watch at 40 mm or above is bought as a travel instrument and worn as one. At 36 mm with a set bezel it is bought as a watch to be worn every day, with the complication treated as a reason to choose it rather than the purpose of owning it. That is a subtler proposition and a harder one to build, because the watch has to survive being looked at as jewellery while still working as a complication.
This reference is for a collector who wants a real complication in a small watch and is not willing to give up decoration to get it. That combination eliminates most of the market in both directions, since technical buyers usually accept a plain larger watch and decorative buyers usually accept a simpler one. The hand-cut dial is the element most likely to decide the purchase, because guilloche of this kind cannot be photographed convincingly and has to be seen moving under light. Now that the reference has left the catalogue the production is fixed, and coloured guilloched dials in a specific shade are the configurations that become difficult to find first. The buyer is someone who travels, wants the complication that reflects it, and refuses to wear a 40 mm watch to get it.
