In terms of shape and size, the new gold Nautilus models are exactly the same as the steel version, with a diameter of 43 mm, 1 mm larger than the 1976 original. This enlargement is not associated with the trend toward more dominant watches but has to do with the lateral hinge extensions that were broadened by half a millimeter to accommodate a softer curvature. And like the new stainless steel model, the gold versions also have three-part cases, a screwed back with a sapphire-crystal window, and a screw-down crown.

They, too, are water-resistant to 120 meters. Its self-winding heart, powered by an extra-heavy 21K gold central rotor, is the Patek Philippe caliber 315 SC movement (S stands for sweep seconds, C for calendar), acclaimed among collectors and connoisseurs alike. It displays the hours, minutes and seconds with hands from the center, and the date in an aperture at 3 o’clock.

To spotlight the aesthetic combination of materials, the dials match the case color in each version. They are silvery for the yellow-gold model, a warmer brown-charcoal for the rose-gold model, and a cool slate gray for the white-gold model. The brown-charcoal dial is galvanized and lacquered to produce a light-to-dark gradation from the center to the periphery. The silvery gray and slate gray dials are galvanized and not gradated. All dials feature the distinctive Nautilus horizontal embossing pattern and large applied luminous hour markers in yellow, white or rose gold to match the case.

Movement
		Caliber 315 S C Self-winding mechanical movement
Diameter	:	27 mm
Height	:	3.22 mm
Number of parts	:	213
Number of jewels	:	29
Power reserve	:	Min. 38 hours, Max. 48 hours
Winding rotor	:	21K gold central rotor, unidirectional winding
Balance	:	Gyromax
Frequency	:	21,600 semi-oscillations per hour (3 Hz)
Balance spring	:	Flat
Functions	:	Three-position crown: - Pushed in: to wind watch - Pulled out halfway: to correct the date - Pulled out all the way: to set the time
Displays	:	- Hours, minutes and center sweep second - Date in an aperture at 3 o’clock
Hallmark	:	Geneva Seal
Features
Case	:	Tripartite (back, caseband, bezel) In 18K yellow, white or rose gold, sapphire-crystal back, water-resistant screw-down crown Bezel and caseband with an interplay of satin-finished and polished surfaces Water-resistant to 120 meters
Case dimensions	:	From 3 to 9 o’clock: 43 mm (including hinges) From 3 to 9 o’clock with crown: 44 mm From 6 to 12 o’clock: 38 mm (bezel) From 2 to 8 o’clock: 40 mm Overall thickness: 8.30 mm crystal to case back Overall thickness: 7.75 mm crystal to lugs
Dial	:	Yellow gold: silvery White gold: slate Rose gold: Gradation from dark brown in the middle to black at the periphery Embossed horizontal relief 12 applied baton-style hour markers in 18K yellow, white or rose gold with luminescent coating Baton-style hour and minute hands in 18K yellow, white or rose gold with luminescent coating Yellow, white or rose seconds hand
Strap	:	Alligator, seamlessly attached to the case, chocolate with yellow gold, matte safari black with white gold and dark brown with rose gold New 3-blade security fold-over clasp in 18K yellow, white or rose gold