This watch has mechanical manually wound movement Caliber R TO 27 PS QR. Minute repeater. Tourbillon. Chime with two gongs activated by a slide piece in the case. Perpetual calendar with retrograde date hand. Day, month, leap year in apertures. Moon phases. Seconds subdial. Black enamel dial, gold applied hour markers. 18K gold dial plate. Shiny black alligator strap with square scales, hand-stitched, with fold-over clasp. Interchangeable full back and sapphire-crystal case back. Case is humidity and dust protected only (not water resistant). Platinum case diameter: 40.2 mm.