This is the widest gap the model can put between a dial and the case around it. The ground is bright black, which returns less light than anything else in the range, and the bezel is set with diamonds, which returns more. Nothing else on the reference produces that spread: the paved and mother-of-pearl dials meet the bezel at close to its own value, and the colored grounds sit somewhere between. Here the two extremes are adjacent, separated by nothing but the edge of the crystal, and the watch reads as a bright ring with a hole in the middle of it until the markers resolve.
Bright black is a lacquered surface with a hard reflective finish rather than a matte one, and the distinction carries the dial. A matte ground would absorb light and go dead under a set bezel, leaving the watch looking like a frame around an absence; this one returns light from a smooth surface, so it holds depth and the reflections travel across it as the wrist turns. The markers are applied in white gold, standing proud with polished faces, and against black they sit at the highest contrast the model achieves without stones, higher than gold on white and higher than baguettes on any pale ground. White gold reinforces the arrangement rather than complicating it, since the case reflects close to neutral and puts no color between the dial and the bezel. The case is 40mm with the flat wide lugs and low band the model uses throughout, and the President bracelet closes it in polished semi-circular three-piece links. A set bezel scales with the case, so the band at this diameter is broader than the same treatment at 36mm and carries more stones around a longer circumference. Against black that width works in the watch's favor. A narrow ring would read as a bright outline; this one reads as a surface in its own right, wide enough to balance the dark field it encloses rather than merely edging it, which is why the contrast lands as deliberate rather than as an accident of specification.
A dark ground is the easiest surface in the range for the calendar to occupy, and none of that advantage is given up here. Printed discs match a deep flat black closely, the contrast between a light numeral and a dark background is the most legible arrangement the model produces, and the frames are free to be decorative rather than corrective. The day is spelled out in full at twelve in words rather than three-letter abbreviations, which fixes the arc's width across every reference, and at this diameter it takes proportionally less of the dial than the same arc does at 36mm. The date sits at three under a lens set into the crystal. Both discs advance instantaneously at midnight rather than turning through the preceding hour, the movement runs roughly seventy hours off a full wind, and setting is done through the crown alone. The hands have the easiest job on this dial that they have anywhere in the model. Polished white gold against a black ground is the highest contrast the range produces, so their taper and finish matter less here than on a shell or metallic surface where they can lose their edges entirely. What they have to avoid instead is being read as markers, and the answer is shape rather than brightness: the hands taper and the applied markers do not.
White gold at 40mm carries eleven grounds, which is the platinum roster with ice blue and its set version removed and nothing else altered. The same relationship holds at 36mm, so ice blue is the entire difference between the two cool metals throughout the model, at both sizes. Bright black is one of the eleven and one of the three grounds here offered plain and set, alongside nothing else on this roster except the choice between them, since every other ground arrives in a single treatment. It reaches platinum, white gold and yellow gold and skips Everose at every size, and it exists at 40mm and nowhere smaller. Two references carry the white gold roster, 228239 with a fluted bezel and this one with a set bezel, and their eleven configurations are identical. One thing this roster does not offer anywhere is a choice of markers. Eleven grounds and eleven configurations means every dial arrives in a single treatment, decided before the buyer sees it. That is not true at 36mm on the same metal, where mother-of-pearl is presented in two marker arrangements, so moving up a size removes the only decision of that kind white gold ever offers. It is a quiet consequence of choosing the larger case and nothing in the range flags it.
An unset black dial under a set bezel is the configuration collectors argue about, and both sides of the argument are reasonable. Read one way the dial has declined to participate and the watch is unresolved. Read the other way it is the only version of a set-bezel Day-Date that stays legible in any light and at any angle, because the stones are all outside the crystal and the dial itself is the most readable surface the model makes. The second reading holds up better with wear. Set and paved dials are difficult to read quickly and stone dials depend on the light; black with applied markers does neither, so this is the fully set-bezel watch that can be worn without thinking about it. For a buyer who wants the case decorated and the dial to stay a dial, it is the clearest answer on the reference. The fluted alternative exists on 228239 with the identical dial, and between them they cover both readings of what a black dial is for.
