Remove the numerals from a reflective dial and nothing on it holds a fixed value. Reference 278243 is the 31mm Datejust in a combination of stainless steel and yellow gold with a domed yellow gold bezel, and this configuration carries a silver dial set with diamond markers and no numerals at all, on the Oyster bracelet. The ground reflects, the markers reflect, and there is no printed or applied element anywhere on the surface that stays the same brightness as the light changes. It is the least anchored dial the reference offers and the one that changes most between one room and the next.
Whether that is a problem depends entirely on what the dial is for. A watch read at a glance benefits from something fixed to orient against, and a watch looked at benefits from the opposite, and this configuration commits fully to the second. The markers are set with diamonds and stand slightly proud of the surface, and the shadow beneath each one is what registers first, since stone and ground sit close in value with no strong contrast between them. Silver is a reflective ground rather than a colored one, taking on whatever surrounds it, so inside a warm case it picks up a gold cast it does not possess and runs warmer under a low lamp than in daylight. Steel and yellow gold is the most visible two-metal pairing Rolex makes, since yellow gold sits nowhere near steel in color and every place the two meet reads as a clear boundary between materials. The steel forms the case and the outer bracelet links while the gold takes the domed bezel, the crown, the bracelet center rows and the marker settings, and the gold is solid rather than plated or capped, which is why these bracelets hold their appearance across decades where most of the industry's two-tone watches do not. The bracelet is the Oyster, three broad flat links brushed across the top with polished flanks, tapering toward the clasp so the weight sits forward on the wrist. The date sits at three under the Cyclops lens on a matched disc, its frame polished gold and set level with the surface. The hands are polished yellow gold and drawn for this case size rather than scaled from a larger one, kept narrow so they cross a field of raised markers without appearing to collide with them. Rolex proportions the aperture frame the same way, since a window drawn for a larger dial crowds a smaller one. Rolex also keeps the settings low and tight against the dial, since a reflective ground exposes any misalignment with nothing to conceal it and a raised marker on a 31mm dial has little room before it starts to crowd the hands.
The Datejust shows the date and nothing else, and on this dial the aperture is the only element with hard contrast, since the printed disc is a genuinely different value from everything around it. That gives the eye a fixed point on a surface that otherwise offers none, which is a role the date does not usually play. A single aperture also keeps the marker ring uninterrupted, since a second would break a pattern depending on continuity. The Cyclops lens above it has been part of the Datejust since 1953 and magnifies the date roughly two and a half times. The date changes instantaneously at midnight rather than creeping through the surrounding hour, the feature the Datejust introduced in 1945 and the one it takes its name from. Correction runs through the winding crown without moving the hands, and nothing the watch asks for requires a tool. The movement is self-winding with a power reserve of approximately 55 hours, an engineering result on a movement built to fit a 31mm case rather than a figure carried down the range. The rotor winds in both directions rather than only one. The crown screws down against the case, and the Oyster closes with a concealed clasp folded away inside the links. Correction takes seconds and requires no tool.
The Datejust arrived in 1945 as the first self-winding wristwatch to show the date in a window, and the 31mm case sits between the 28mm Lady-Datejust and the 36mm original. 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 supplies the structure and gold supplies the color. Silver has been in the dial range across every generation and is one of the few grounds that has never left it, and gem-set markers on silver have been offered nearly as long, which is why the combination reads as the default version of a set watch rather than as a choice within one. Within the generation, 278243 is the steel and yellow gold reference with a domed bezel. Gem-set dials have also been part of the model for most of its history and remain a minority of what Rolex builds in any given year. Silver is one of three grounds on this reference built in two set arrangements, alongside dark grey and olive green, and this is the version where stones stand in place of the markers rather than alongside an enlarged numeral.
The buyer for this wants the stones and does not want a marker set competing with them. On the Roman version of the same ground the numerals dominate the composition and the diamonds sit between them, and here the stones are the composition, spaced evenly with nothing else on the dial to divide attention. That produces a cleaner and considerably less legible watch, which is the trade being made. It is also the most conventional gem-set dial on the reference and the easiest to live with, showing no variation between examples and none over time. It is the version to own if the watch is going to be looked at more often than it is read. It is the quieter of the two silver marker configurations and the one more often worn daily. Silver holds four of the twenty-two rows on this reference, which is twice what any single-arrangement ground holds here.
