This watch has mechanical manually wound movement Caliber R TO 27 PS QR. Minute repeater. Tourbillon. Chime with two gongs activated by means of a slide bit in the circumstance. Perpetual calendar with retrograde hand. Day, month, leap year in apertures. Moon phases. Seconds subdial. 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 dust and humidity protected only (not water resistant). Platinum case diameter: 40.2 mm.