Before comparing anything, the answer: the only Patek Philippe 7118 with a factory blue dial that you can legally buy, wear, insure, and resell in the United States is the genuine reference itself. A "replica 7118 blue dial" is a counterfeit of a protected design, and in the US it can be seized at the border and destroyed. The criteria that actually decide whether a blue-dial 7118-style watch is worth owning are dial finish, movement, case and bracelet finishing, water resistance, documentation, and legal status. Every one of those criteria points the same direction.
What the 7118/1A blue dial really is
The 7118/1A is the smaller Nautilus in stainless steel, sized at roughly 35 mm for narrower wrists. Its case has the rounded octagonal bezel, the lateral hinges, and an integrated bracelet that tapers into a folding clasp. The blue dial uses a horizontally embossed pattern, applied gold numerals on the later dial variants, a date aperture, and sweep seconds driven by a self-winding Patek Philippe caliber. The blue is not flat; it shifts between steel gray and deep blue depending on the angle of light.
- Pro: factory spec is published and checkable, so authenticity can be verified against the maker's own catalogue.
- Pro: full service history, box, and papers are available, which protects resale value.
- Con: allocation at retail is limited and secondary market prices run well above list.
- Con: servicing costs are high and turnaround can take months.
What the replica version actually is
Most watches sold under this description use a generic stainless steel case, a printed or stamped dial pattern, a low-cost automatic or quartz movement, and a caseback engraved to imitate a Patek Philippe reference number. The blue dial is the hardest single element to copy because of the embossed texture and the way genuine dials change color as you move your wrist. Replicas usually read flat and slightly purple under indoor light.
- Pro: low purchase price, and the general silhouette reads as a Nautilus from a distance.
- Con: no legal ownership in the US, no service network, no insurance, and no resale market.
- Con: water resistance is not what the engraving claims, and movement failure is common within a year or two.
- Con: dial printing, bracelet taper, and case bevels are the first tells under close inspection.
Criteria that separate the two
- Dial texture: genuine embossing is crisp and directional; replicas look stamped or flat.
- Color shift: genuine blue moves between gray and blue; replicas stay one shade.
- Case finishing: polished bevels and brushed flats meet at a sharp, consistent line.
- Bracelet: links taper gradually and the clasp closes with a solid, damped action.
- Movement: winding feel is smooth and the rotor is finished on both sides.
- Documentation: reference numbers, movement numbers, and papers match each other.
The legal reality in the United States
Counterfeit goods are prohibited from import under US customs law and are subject to seizure and destruction. Trafficking in counterfeit merchandise is also a federal trademark offense, and that exposure applies to buyers who resell, not just sellers. A watch that cannot be serviced by its maker, cannot be insured, and cannot be lawfully shipped is not a bargain at any price. If a listing claims the watch is a replica, that claim is an admission of infringement, not a quality promise.
Legitimate routes to the same look
- Pre-owned genuine: buy through an authorized dealer's pre-owned program or a major auction house with a condition report.
- Independent watchmakers: several established brands build stainless steel sports watches with integrated bracelets and blue textured dials.
- Save and wait: the secondary market for the stainless Nautilus does soften, and patience beats a counterfeit every time.
Bottom line
If the search was about how close a replica 7118 blue dial gets to the real thing, the honest answer is: close enough to fool a photograph, not close enough to fool a jeweler, and never close enough to be legal. The genuine reference, a pre-owned example, or a well-made non-counterfeit alternative is the only path that gives you a watch you can actually own.