Three references carry mother-of-pearl in white gold and this configuration sits exactly between them. 128239 puts the dial under a fluted bezel with nothing set outside it. The fully set version of 128349RBR surrounds it with stones at the bezel and again down the bracelet. This one takes the set bezel and stops there, leaving the bracelet plain, so the decoration is contained within the diameter of the case and the wrist below is left as unbroken white gold. With the same dial available at all three points, the scale is unusually easy to read, and the middle of it is where most buyers who work through the comparison end up.
The material is the inner layer of a mollusk, cut thin and laid over a base rather than applied as a finish, its stacked platelet structure splitting light as it passes through and returns. The ground never holds one value, drifting between white, cream and pale green as the wrist moves, and each slice carries a figure specific to it. White gold reflects close to neutral and adds no tone of its own, so the shell shows what it is rather than what the case makes of it. The markers are baguette-cut stones running the whole way around, identical in cut, length and orientation and laid flat rather than raised, so they return light in broad planes from a single angle while the ground scatters it unevenly. Nothing is framed and nothing accents six or nine. The bezel is set with diamonds around its full circumference and the President bracelet runs from the lugs in polished semi-circular links, and the case is 36mm with the low band and wide flat lugs standard across the model. The ring of stones around the bezel ends at the lugs, and that ending is the whole geometry of the watch. A set bracelet would carry the line past the case and down the wrist, making the dial one element in a longer sequence; stopping it at the lugs turns the bezel into a closed frame with the shell inside it. The proportions support that reading, since the set band is narrow relative to the dial it encloses, so what dominates is the ground rather than what surrounds it.
Because the hour ring carries no accent and no gold, the two calendar openings become the only irregular shapes on the dial, and the eye locates them without having to sort them out from competing bright features. That is a practical advantage on a ground this active. The day is spelled out in full at twelve in words rather than three letters, which fixes the width of the upper opening across every dial in the model, and the date sits at three beneath a lens set into the crystal. Both openings are framed, since an unframed edge would show the laminate in section and a flat printed disc needs a firm boundary against a surface with no fixed value to match. Both discs jump instantaneously at midnight rather than turning gradually through the hour before it, and the movement runs about seventy hours off a full wind. Everything is operated through the crown alone. Matching a printed disc to this ground is not possible in the way it is on a flat dial, and the model does not attempt it. The disc carries a single flat value while the shell around it moves through a range, so the two agree at some moments and diverge at others, and the frame is what keeps that from reading as an error. On a white gold reference the frames are the same cool metal as everything else, so they mark the boundary without introducing a second color to the dial.
Nine grounds are offered on white gold at 36mm, the platinum roster minus ice blue and its set version, and mother-of-pearl is one of three colorless grounds on it that reach all four case metals and both case sizes. It is also the only ground on the roster available in two marker arrangements, and this is the one that travels: the all-baguette dial exists everywhere the ground is made, while the gold-framed alternative stops at 36mm and has no version at the larger size. So a buyer choosing this arrangement is choosing the version the model carries universally, and choosing it on the reference that offers the widest range of surroundings, since 128349RBR is the only white gold reference with a diamond-set bracelet available on every dial it makes. What makes the comparison across the three references unusually clean is that nothing else varies. Same case, same movement, same nine grounds, same two marker arrangements on this one ground, so the only differences between the three watches are the bezel treatment and, on this reference alone, the bracelet. That is rare in a range of this size, and it means a buyer can settle the dial first and then work through the surroundings without either decision affecting the other.
The middle position is the one that holds up longest, and the reason is straightforward. A fluted bezel keeps the watch conservative and gives the shell nothing to answer; a set bracelet commits the piece to being looked at and pushes the dial into the background. A set bezel with a plain bracelet does neither. The stones form a ring that ends at the lugs, so the dial is framed rather than surrounded, and the shell remains the most active thing on the watch while still having something fixed to be measured against. It is also the most wearable of the three, since an unset bracelet is lighter, quieter under a cuff and easier to live with day to day. For a buyer working through the white gold references with this dial in mind, this is the configuration that answers most of what the other two are each doing by halves.
