This Nautilus has a stainless steel case and bracelet. Fixed bezel. Transparent case back. Dark blue dial with silver tone hands and index hour markers. Luminescent hands and markers. Date and moonphase display at the 6 o'clock position. Power reserve indicator display at the 10 o'clock position Scratch resistant sapphire crystal. Patek Philippe Calibre 240 PS IRM C LU has a 48 hours of power reserve.