It takes after the iconic Mark II's iconic grey dial with a burgundy seconds track. All time telling hands are rendered white while hands related to the chronograph function are rendered orange.
Powered by the caliber 861, it is a modern update of the original caliber 321 that went to the moon. Besides switching out the column wheel for a shuttle cam, several components were made from special alloys to better resist the extreme temperature variation in space.
While its dial bears semblance to the Mark II, it kept its case shape modern with "twisted" lugs features, a coveted detail by some collectors who prefer the stylised edges compared to "straight" lugs.