If you want a Patek Philippe reference 5370P, the only version worth buying is the genuine article: a platinum split-seconds chronograph with a grand feu enamel dial, sold new by an authorized dealer or on the secondary market as a documented, traceable lot. Judge every candidate against five criteria: the enamel dial and its printing, the CHR 29-535 PS movement visible through the display back, the case profile and hallmarks, the paperwork and service history, and whether the price sits anywhere near real market results. Fail two or more of those checks and the watch is a copy, no matter what the seller says in the listing.
What Reference 5370P Actually Is
Patek Philippe introduced the 5370P in 2015 as a platinum split-seconds chronograph with a black grand feu enamel dial, then added a blue enamel variant later in the run. The case measures roughly 41 mm, the chronograph winds by hand, and the in-house CHR 29-535 PS movement carries a split-seconds (rattrapante) mechanism with column wheels. That combination is the whole point of the reference, and it is also why copies are so easy to expose. A split-seconds chronograph is one of the hardest complications to reproduce in any convincing way, so the fakes tend to win on the dial and lose everywhere else.
Criterion 1: The Enamel Dial and Its Printing
Grand feu enamel is fired, not painted. It has depth, a faint glassy surface, and a warmth that shifts as the light moves, and the print sits on the surface rather than soaking into it.
What genuine enamel dials get right:
- Crisp, evenly weighted numerals and signature with no bleed at the edges
- A surface that reflects light in soft patches instead of sharp glare
- Tracks and subdial rings printed to a consistent width across the dial
- Subdials that line up with the case center line from every angle
What replica dials miss:
- Flat, plasticky gloss that photographs well and looks dead on the wrist
- Thick or smeared printing, worst in the fine scale divisions
- Subdials sitting slightly off center or spaced too tightly
- Signature lettering that is too bold, too light, or unevenly spaced
Criterion 2: The Movement Behind the Display Back
The display back is your single best check. On a real CHR 29-535 PS you see a hand-finished, manually wound caliber with Geneva stripes, polished bevels on the bridges, blued screws, and a column wheel governing the chronograph. The split-seconds lever and clamp sit under the dial side, so a movement that shows no evidence of the rattrapante mechanism cannot be a split-seconds watch at all.
What holds up under a loupe:
- Anglage that is wide, flat, and evenly polished along every bridge edge
- Jewel countersinks that are round and bright, not punched and dull
- Engraving that is sharp and shallow, not stamped and grainy
What gives copies away:
- Plated brass plates with printed stripes instead of real Geneva stripes
- Screws with chewed slots or a mirror finish that no genuine watch uses
- A rotor, an automatic winding bridge, or a battery hatch on a watch that should wind by hand
Criterion 3: Case, Weight, and Hallmarks
Platinum is dense. A 41 mm platinum watch has a heft that you feel immediately, and the case should carry the correct precious-metal hallmarks along with the case number. The lugs should be thick and finished by hand on the flanks, with a polished bevel running the full length of the case band. Copies tend to be lighter than the metal demands, because the metal is not correct, and the hallmark stamps are often shallow or placed in the wrong spot. Have a jeweler test the metal before you commit. Also compare the case number to the one recorded on the paperwork, not just the serial on the movement.
Criterion 4: Paperwork, Provenance, and Price
A genuine 5370P comes with a certificate or an extract from the archives, a matching presentation box, and a service history that can be confirmed. Sellers of copies rely on one of two stories: the papers were lost, or the price is simply too good to pass up. Neither holds up. Compare any asking price against published auction results for Patek Philippe split-seconds chronographs; if the number sits far below that range, the watch is not genuine, and there is no third explanation.
Red Flags to Walk Away From
- The seller refuses to send movement photos with the case back removed
- The dial is described as enamel but reflects light like lacquer or vinyl
- Serial and case numbers do not appear on any extract or service record
- The price is a fraction of comparable auction results and framed as urgent
- Photos only show the watch at a distance, angled away from the subdials
- The listing uses stock images from a brand catalogue instead of the actual watch
Which Buyer Should Do What
If you want the split-seconds look on a modest budget, be honest with yourself: no copy of a 5370P will survive a side-by-side comparison, and it will not be serviced by the manufacturer when it stops. A column-wheel chronograph from a brand that maintains its own service network gives you the mechanical feel without the legal exposure. If you are buying the real reference, hire a watchmaker with Patek experience for a pre-purchase inspection and request the extract from the archives before money changes hands. If you already own a watch sold to you as a 5370P and you are not certain, take it to an authorized service center. They can open the case, identify the movement, and tell you plainly what you have, which is far cheaper than finding out during a later resale.
The Bottom Line
The 5370P is a specific object: platinum, hand-wound, split-seconds, grand feu enamel, and fully documented by the maker. A convincing fake needs to fake all five at once, and none of them do. Start with the movement, confirm the metal, then verify the paperwork, and the question answers itself.