
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. 
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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 |
