With the tone settled across the entire watch, texture is the only variable left. Reference 278343RBR is the 31mm Datejust in a combination of stainless steel and yellow gold with a domed bezel set with diamonds, and this configuration carries a champagne dial with diamond markers in gold settings and no numerals, on the Jubilee bracelet. Nothing here contrasts by color. The dial, the bezel, the marker settings and the gold rows of the bracelet all sit in the same warm register, and the steel at the case flanks and outer links is the only departure from it. So the watch has to distinguish its parts some other way, and it does that entirely through surface: polished against brushed, domed against flat, broad against fine. It is the least obvious of the fully specified versions and the one that takes longest to read.
The Jubilee is the element that changes the surface without changing the register. Its five-piece links run roughly twice the component count of the Oyster across the same width, with polished gold rows down the middle and brushed steel to either side, and the result is a bracelet that reads as fine-grained where the case reads as solid. Set next to a champagne dial the difference is entirely one of scale and finish. The dial is a single continuous warm surface applied flat and even so it returns light without a hot spot. The bezel is domed and polished and throws a highlight that moves. The bracelet breaks into small bright segments that shift constantly as the wrist does. Three different rates of change across one color. The diamond markers sit in solid gold surrounds kept low and tight, since a raised setting on a 31mm dial interferes with the hands before it looks generous, and their facets are the only element on the watch that is neither warm nor steel. Everything gold is solid rather than plated or capped, covering the bezel, the crown, the bracelet center rows, the marker settings and the hands, while steel takes the case body and the outer links.
The mechanism underneath all of that is a single complication, and an old one. The date advances in an instant at midnight instead of drifting through the surrounding hours, which is what the Datejust introduced in 1945 and what its name refers to. The disc is matched to the champagne ground so the aperture does not open a pale gap in a warm surface, and the frame around it is drawn for a 31mm dial rather than scaled down from a larger one, which keeps it from pressing on the markers to either side. The Cyclops lens above the window, fitted to the model since 1953, enlarges the numeral roughly two and a half times, and on a dial carrying no printed numerals it is the only place the eye finds a fixed character. Setting the date runs through the winding crown at its own position and leaves the hands alone. The movement is self-winding with a power reserve of approximately 55 hours, built for this case width rather than borrowed from a wider one, since a narrower barrel stores less energy and a lighter rotor gathers less from the same motion. The crown screws down and the bracelet folds shut on itself.
The Jubilee was made for the Datejust and introduced with it in 1945, and it has stayed attached to the model in a way it never quite has to anything else Rolex builds. The watch itself was the first self-winding wristwatch to display the date through a window, and it has been produced continuously since. The 31mm case falls between the 28mm Lady-Datejust and the 36mm original, and the 278000 generation replaced the 178000 series in 2018 with a revised case and bracelet. Rolex registered the name for its steel and gold construction in 1933. This particular assembly, a warm dial with gold settings under a set bezel on a Jubilee, is close to the definition of a two-tone Datejust as it was understood through the 1970s and 1980s, when the model was at its most visible and this was the configuration most people pictured. Rolex has kept it rather than reintroduced it, which is the difference between a continuous option and a revival. Within the generation, 278343RBR is the steel and yellow gold reference with a diamond-set domed bezel, and champagne is offered on it both with set markers and with no stones in the dial at all. Both of those dials are available on either bracelet, so the choice of ground and the choice of bracelet stay independent of each other.
The buyer for this one is usually not building a collection around it. It is a watch chosen to be worn constantly, and the single-tone approach is what makes that possible, since nothing about it fights with what it is worn against. The Jubilee is the reason it wears well rather than merely looks complete, since a bracelet that flexes at short intervals settles into position faster than one built from three wide links. That said, the specification is fully loaded, and anyone expecting restraint from a watch with stones in the dial and around the bezel will not find it. What they will find is that all of the ornament is delivered in one register instead of several, which is a different thing from restraint and reads better over time. Buyers tend to arrive here from the plain champagne version wanting the dial to carry something, or from the white and silver grounds wanting less contrast rather than more. Both routes converge on the same watch. It is also the version that most often gets kept when a collection is thinned, on the grounds that it goes with everything else in it.
