No other ground changes its treatment at every size. Slate set with diamonds takes an oversized VI at 31 mm on the Everose cases, a ring of settings joined by baguette-cut stones at six and nine at 36 mm in solid Everose, gold Roman numerals at six and nine at 36 mm on the steel and Everose construction, and a plain ring of settings at 41 mm, where it also changes metal family and appears on a steel and white gold case. Four treatments, three diameters, two metal families, and nothing carried over between any two of them. This variant is the first of those, in a 31 mm case of steel and Everose gold, under a fluted bezel, on a Jubilee bracelet.
A grey ground is the reason so many arrangements work on it. Slate sits at a value where applied gold separates cleanly without the harshness a black dial produces, and where stones read at full strength without the ground competing, so almost any marker treatment is legible on it and the collection has evidently taken advantage of that. The oversized VI here is distinguished by scale rather than material, being the same gold and carrying the same stones as the settings around it, and on slate that comparison is easy to make because everything applied stands clear of the surface. On a pale or a warm ground the same numeral separates weakly and the size difference is harder to judge. The Everose of this construction sits in the fluted bezel, since fluting is never cut into steel, and the case sides, lugs and bracelet are steel throughout. There is a further reason grey supports so many arrangements while other grounds support one. A dial has to give an applied element either tonal separation or a shadow to be read by, and most grounds supply one and not the other: black gives contrast and no shadow, pale grounds give shadow and no contrast, and shell gives neither reliably because the surface itself moves. Slate supplies both. An applied numeral separates by tone and casts a visible shadow, so any treatment placed on it is legible without adjustment, and the collection has used that latitude on this ground more than on any other.
The plate is worked at each hour position for the settings and again at six for the numeral, which is anchored at a different depth, and it must still lie flat beneath the hands. That is close to the practical ceiling for a 31 mm plate and it explains why the treatment enlarges one numeral rather than adding a second, where the 36 mm cases have the reserve for a pair. Behind the dial the movement is built specifically to this diameter, self-winding, holding close to 55 hours away from the wrist against roughly 70 for the 36 mm references, with barrel volume accounting for the whole of the difference. The date sits at three beneath its magnifying lens and the crown screws home when the watch is not being set. The plate carries a further constraint that shows in where the treatment appears. Anchoring a numeral at a second depth alongside settings at every hour position is close to what a 31 mm plate will support, and it is why the enlarged VI exists at this diameter rather than lower down. At 28 mm the same ground is not offered set at all, and at 36 mm the plate has reserve for a pair of numerals instead, which is the treatment those cases receive.
The set version of the ground is also confined in a way the plain version is not. Unset slate runs from 31 mm to 42 across steel, white gold, platinum and the steel and gold constructions, while the set version appears on Everose at 31 and 36 mm and then, at 41 mm, on a steel and white gold case alone. So the stones narrow the ground to one metal family through the middle of the range and release it into a different one at the top. That is a shape no other ground on this reference has, and it means a buyer who wants a set slate dial is choosing a metal family as part of the same decision, with the family depending on which size they take. That is an unusual amount of movement for one ground and it makes the set version considerably harder to plan around than the plain one. A buyer who settles on set slate at 31 mm is on Everose; the same decision at 41 mm puts them on a steel and white gold case; and at 36 mm the treatment differs between the two Everose constructions as well. Four sizes, four answers, and the dial name is identical throughout.
The argument for this configuration is that it is the most legible set dial the reference makes. Grey gives stones and gold the clearest field either could ask for, the oversized numeral supplies orientation without a second material, and the Everose is confined to a single ring at the bezel so the watch never reads as a gold object. Collectors who choose it usually want a set dial that stays serious and a detail that requires knowing the range to appreciate. The Jubilee keeps the piece comfortable through a full day. Among the arrangements offered here it is the one where ground and treatment were best matched to each other. It is also the version most likely to be chosen by someone who has looked at the ground across sizes, since the comparison is what shows how much better this pairing works than the alternatives the same dial receives elsewhere. Slate is offered more ways than any ground in the range and this is the arrangement that justifies the latitude, since an enlarged numeral asks the ground to do something no other treatment requires of it.
