The dial of the Patek Philippe Nautilus 5711/1P 40th Anniversary is certainly the main difference here. Made in solid yellow gold, it shows a bright blue color (much lighter than the steel edition) obtained by PVD and with a bright/dark gradation from the inside to the outside, still with embossed horizontal lines and sun-ray pattern. The logo at 12 is printed on a flat area (while the dial is entirely embossed on the blue steel edition), however that s something the gold edition also has. Another difference with the steel edition is the date circled by a white gold window. The hands are white gold and faithful to the traditional design of the Nautilus.