The only part of this watch carrying any information is the only part that is not bright. Reference 278341RBR is the 31mm Datejust in a combination of stainless steel and Everose gold with a domed bezel set with diamonds, and this configuration carries a rose dial with applied hour markers and no stones, on the Jubilee bracelet. A band of diamonds runs around the outside of the crystal. Below the case the Jubilee alternates polished gold with brushed steel along the entire wrist. Both are decorative and neither tells anyone anything. Between them sits a dial matched to the case metal with markers of that same metal, which is the least visible surface on the watch and the only one that has a job to do.
Strip the dial and set the case, and the watch has divided its two jobs between them rather than asking any one surface to do both. The bezel is a dome set with stones, curved rather than flat, so its diamonds sit at varying angles and an arc of the band is lit whichever way the watch is held. The Jubilee runs roughly twice the component count of the Oyster across the same width, polished Everose down the middle and brushed steel to either side, returning light continuously as the arm moves. Between them the dial gives up almost everything. Its rose ground is an opaque lacquer applied in thin coats to hold an even tone across the curve, pitched to Everose, which is alloyed with platinum so the color holds rather than drifting toward yellow over decades. The markers standing on it are solid Everose applied rather than printed, so they carry height and cast edges, and that shadow is the only thing separating them from the surface beneath. They are the smallest elements on the watch by a wide margin and the only ones that matter functionally. Steel takes the case body and the outer links, and every gold element on the watch is solid rather than plated or capped. The hands are solid Everose drawn for this case width rather than scaled down from a wider one, and they are the only elements on the dial that move across the ground rather than standing still on it.
Behind all of that the watch runs one complication, and it is the reason the model exists. The date advances in an instant at midnight instead of drifting through the hours on either side, which is what the Datejust introduced in 1945 and what its name refers to. The disc behind the window is matched to the rose ground so the aperture does not open a pale gap in a warm surface, and on a dial carrying this little internal contrast the printed numeral inside it is the darkest thing anywhere on the face, and in practice the fastest thing on it to read. The frame is proportioned for a 31mm dial rather than scaled down from a wider one, so it stays clear of the markers at its shoulders, and the Cyclops lens above it, fitted to the model since 1953, enlarges the numeral roughly two and a half times. Setting the date runs through the winding crown at its own position and leaves the hands untouched. The movement is self-winding with a power reserve of approximately 55 hours, designed for this case width rather than borrowed from a larger one, since a narrower barrel stores less and a lighter rotor gathers less from the same motion. The crown screws down and the bracelet closes on a concealed clasp.
The Jubilee was introduced with the Datejust in 1945 and built for it, which is why the pairing reads as original rather than as a choice made afterward. The model was the first self-winding wristwatch to display the date through a window and has been made without interruption 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, on the reasoning that steel does the structural work and gold does the visible work. Everose arrived in 2005 and the matched dials were developed against it rather than the other way round. Within the generation, 278341RBR is the steel and Everose reference with a diamond-set domed bezel, and 278241 carries the identical dial and bracelet under a plain dome. Between those two this configuration changes more than any other on the reference, because a matched dial with applied markers has no presence of its own and takes its entire character from whatever surrounds it. Under a plain bezel it is the quietest watch the pairing makes. Under this one it is a bright watch with a blank in the middle.
This is the configuration most often bought for the case rather than for the watch, and it is worth being clear about that before choosing it. The dial is the least assertive the reference offers and the bezel and bracelet are the most, so what the owner spends the day looking at is a warm blank surface, while what everyone else sees is a diamond bezel on a busy bracelet. Those are two different watches depending on which side of it you are standing. People who like it tend to like exactly that split. The trade is legibility, since a matched ground with matched markers gives up nearly all its contrast and recovers it only through angle, and under a bright rim the middle can be genuinely hard to read outdoors. Buyers arrive here from the plain-bezel version wanting the watch to register from across a room, and from the set marker dials having decided that stones inside the crystal made the matched ground pointless. Almost nobody arrives from a contrasting dial.
