Mechanical manually wound movement. Caliber R TO 27 QR SID LU CL. Front side: Perpetual calendar with retrograde date hand. Hours and minutes of mean solar time. Day, month, leap year in apertures. Moon phases. Reverse side: sidereal time, sky chart, phases and orbit of the moon.
Dial with black enamel in champlevé and cloisonné, gold applied Roman numerals. 18K gold dial plate.
White gold. Sapphire-crystal case back. Case is humidity and dust protected only (not water resistant). Case diameter: 44 mm. Height: 17.35 mm.
Alligator strap with square scales, hand-stitched, shiny black. Hand-engraved fold-over clasp.