The short answer: every fake Patek Philippe 6002G in circulation is a decorative watch dressed in the look of the Sky Moon Tourbillon. The fastest way to confirm that is to test the watch's functions against the reference. A genuine ref. 6002G is a grand complication with a minute repeater, a tourbillon, a perpetual calendar, and a rotating celestial chart on its reverse. Counterfeits copy the outline, the engraved case, and sometimes the face. They do not copy the mechanics. The four criteria that separate a real one from a fake are the case engraving, the dial and sky chart, the movement, and the documentation chain.

What the ref. 6002G is

Patek Philippe introduced the ref. 6002G as the successor to the ref. 5002 Sky Moon Tourbillon. It is a double-faced grand complication. One face carries a perpetual calendar with a retrograde date and a minute repeater with cathedral gongs. The other carries a celestial chart showing the night sky over Geneva along with the phase of the moon. The case, bezel, lugs, and even the clasp are finished with hand-engraved scrollwork in gold. Production numbers were never published, and the watch reaches buyers through a small client list rather than a display case. That scarcity is the reason counterfeits exist.

Criterion 1: the hand engraving

The engraving is the first thing to examine and the easiest thing to photograph.

Strengths of this check

  • Hand cutting follows the scroll with varying depth and clean terminals, so tool marks look different from one leaf to the next.
  • Magnified photos of the bezel, lugs, and clasp expose a repeating stamped or laser-cut pattern.

Limits of this check

  • Skilled counterfeiters now laser-engrave cases, and the result can pass at arm's length.
  • Most buyers never hold the watch before money changes hands.

Use this as first-line screening only. It rules nothing in.

Criterion 2: the dial and the celestial chart

The sky side of a real 6002G is a working astronomical display, not a printed backdrop.

Strengths of this check

  • The star disc advances with the sidereal day, so the sky shifts across an evening of watching.
  • The moon phase tracks a real lunar cycle over roughly 29 days.

Limits of this check

  • Movement is slow, so a two-minute look reveals nothing.
  • Photos and video can be staged, edited, or borrowed from a real watch.

Use this during an in-person viewing where you can sit with the watch for a few hours.

Criterion 3: the movement

A minute repeater, a tourbillon, and a retrograde perpetual calendar in one movement is the part no replica has matched.

Strengths of this check

  • Chime quality is diagnostic. A repeater sounds clean and even; a fake with a speaker or a silent lever does not.
  • Finishing under a loupe, including Geneva stripes, chamfered bridges, and perlage, shows hand work on a real piece.

Limits of this check

  • It requires opening the watch, which means a qualified watchmaker and a signed work order.
  • An engraved plate or a printed caseback film can hide a cheap movement underneath.

This is the decisive test. Treat any seller who refuses it as a seller to avoid.

Criterion 4: paperwork and provenance

Certificate of origin, service history, and a chain of ownership from an authorized dealer form the paper trail.

Strengths of this check

  • Patek Philippe maintains archive records that can confirm a serial number and a delivery date.
  • A service invoice from an authorized center is hard to fabricate and easy to verify.

Limits of this check

  • Documents are the simplest element of a counterfeit package to reproduce.
  • A genuine serial number can be printed on a fake certificate.

Use paperwork for due diligence. Never use it as the only proof.

Option: inspection at a Patek Philippe service center

Pros

  • The most authoritative answer available, with access to factory records.
  • Written findings you can rely on if a purchase goes wrong.

Cons

  • Slow turnaround and long transport times.
  • Service costs and shipping risk fall on you.

Best for a real purchase decision at a serious price.

Option: an independent watchmaker who services repeaters

Pros

  • Faster and less expensive than a factory service.
  • Many specialists have handled Sky Moon Tourbillons and know the architecture.

Cons

  • Opinions carry no official weight with the brand or an insurer.
  • Quality varies, and some will not open a high-value watch without insurance.

Best when you need a fast second opinion before a scheduled viewing.

Option: photo comparison in collector communities

Pros

  • Free and instant.
  • Experienced members spot obvious tells in the engraving and dial printing.

Cons

  • Strangers judge photos, not watches.
  • Better fakes pass photo review all the time.

Best as a screening step before you spend money on a formal inspection.

Legal and financial reality

Importing, selling, or trafficking counterfeit watches is illegal in the United States. US Customs and Border Protection seizes counterfeit goods, and a seller can face civil claims from the brand plus criminal charges. Buyers lose twice. There is no warranty, no service from Patek Philippe, no resale market, and no way to authenticate the piece later. The gold content and finishing on a replica also rarely match what the listing promised.

Recommendation

If a ref. 6002G is genuinely on the table, make the movement inspection mandatory and walk away from anyone who resists it. If what you actually want is the look of a grand complication and the budget is not there, buy a watch that is honest about what it is. A moon phase or an annual calendar from a mid-tier brand with its own service network costs less than a convincing fake, keeps some value, and will not be seized at the border.