The sunray pattern engraved on the back of the pink gold case radiates from a circular window whose diameter corresponds to that of the three-armed carriage of the tourbillon regulator, a subtle and complex mechanism enhancing the rate regularity of the 19-jewel rhodium-plated movement, measuring about 47 mm across and built for observatory competitions.

Also in pink gold, the dial carries applied Roman numerals in gold, like the hours, minutes and seconds hands.