Patek Philippe’s Nautilus 5712/1A pairs moon phase, power reserve, and date subdials on a single 40mm dial, and this replica Nautilus 5712/1A gold captures that complication trio with a warm gold-toned dial. The 5712 reference has long been considered the collector’s alternative to the time-only 5711 because it offers genuine complications without jumping to the size and weight of a chronograph. At 40mm the case diameter matches the classic Nautilus proportion, and the horizontal embossing on the dial surface gives the gold finish a textured appearance that shifts between champagne and amber depending on lighting angle.

Technical Overview

• Case diameter: 40mm
• Case material: stainless steel
• Dial: gold-toned with horizontal embossed texture
• Subdials: moon phase at 6, power reserve at 10, date pointer at 2
• Crystal: sapphire with anti-reflective coating
• Bracelet: integrated stainless steel
• Movement: ultra-thin caliber 240 PS IRM C LU
• Functions: hours, minutes, moon phase, power reserve, pointer date

The caliber 240 is one of the thinnest automatic movements in production, measuring just 3.88mm tall. This micro-rotor design is what allows three subdials to coexist on a 40mm canvas without visual crowding.

Inside the Movement

The 240 PS IRM C LU caliber handles moon phase tracking with a 122-year deviation cycle, meaning manual correction is needed roughly once per century. The power reserve indicator at 10 o’clock shows approximately 48 hours of autonomy, visible through a graduated arc on the dial. Among Nautilus references, the 5712 is the only one using the 240-series caliber instead of the 26-330 SC, which gives it a distinctly thinner wrist profile. See the full Nautilus collection for how the 5712 sits between the time-only models and the chronograph references. For a different complication approach, the 7118/1450 ladies rose gold shows how the Nautilus DNA translates to a smaller case with simpler movement.

What Sets It Apart

The gold dial on this 5712/1A is warmer and less common than the standard blue or grey versions. Moon phase complications appeal to buyers who value astronomical function alongside timekeeping, and the pointer date adds everyday practicality without requiring a magnifying cyclops lens. The three subdials create visual balance that the time-only Nautilus cannot offer, making this variant feel more mechanically alive on the wrist. This replica Nautilus 5712/1A gold represents the complication-focused side of the Nautilus range at its most visually warm.