The Patek Philippe watch features a self-winding mechanical movement, Caliber 240 LU CL C, offering a date display by hand and hours and minutes of mean solar time. It intricately depicts a sky chart, moon phases, and the orbit of the Moon, alongside the meridian passage times of Sirius and the Moon. The dial is highlighted by black sapphire-crystal disks for the sky background and moon phases, with a transparent sapphire-crystal disk for the sky chart and Milky Way. Set in a rose gold case with a diameter of 44 mm and a height of 10.58 mm, it is water-resistant to 30 meters and features a sapphire crystal case back. The timepiece is finished with a shiny black alligator strap, hand-stitched with square scales, and secured by a fold-over clasp.