F.P. Journe Octa Jour/Nuit Ref. A Ruthenium Platinum Grey Dial

Jour et Nuit puts a day and night indication on the Octa, and this is the version from the Ruthenium Collection, the ninety-nine piece series Journe ran in 2001 across five references in platinum. The treatment darkens the dial and the movement alike. It is the least discussed of the five and one of the harder ones to locate now, since the series closed more than twenty years ago and nothing like it was ever repeated.

The platinum case is 40 mm, standard for the series. A gold plate under ruthenium holds whitened guilloché silver registers, with the time off center and the indication reading through an aperture. The dark ground makes the pale registers stand well clear of it, which was as much practical as decorative. Ruthenium reads nearly black indoors and gray in daylight, so the Octa changes character completely through the course of a day.