Audemars Piguet Code 11.59 26397BC.OO.D357CR.01 '150th Anniversary' Grande Sonnerie Carillon Supersonnerie White Gold Opal Dial

Crystal opal is among the least predictable materials a dial can be cut from — the play of colour comes from silica spheres diffracting light inside the stone, so no two slices behave the same way. Setting it over a grande sonnerie makes this the Code 11.59 at its furthest reach in both directions at once.

The white gold case measures 41 mm in the collection's three-part construction. The crystal opal dial is framed by a blue inner bezel with white gold stick hands. The movement strikes as a grande sonnerie, a petite sonnerie and a minute repeater, with hours, minutes and small seconds. The watch is completed on a blue alligator strap with a white gold folding clasp. Cutting opal thin enough for a dial without losing the piece is the constraint that decides how many can exist.

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