Mother-of-pearl is shell rather than paint, so no two of these dials are ever quite alike and the iridescence shifts with every angle the wrist takes. On a fluted bezel with nothing set into it, the shell is the only thing on the Day-Date that moves in the light. That restraint is what separates this from the gem-set versions of the same face. It is comfortably the quietest way that anyone can actually buy the material.

A 36 mm case in White Gold beneath a fluted bezel, on the President bracelet with its semi-circular three-piece links. Ten baguette-cut diamonds mark the hours across a white mother-of-pearl dial cut from shell. The iridescence beneath them turns between pink, green and silver as the watch moves. The day is spelled in full at twelve, the date sits at three under the Cyclops, and a concealed Crownclasp closes the bracelet.

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