Short answer: a fake Golden Ellipse 5738 fails on three things more often than anything else. Thickness, the movement, and the dial's sunburst finish. The genuine reference is 5.9 mm thick and runs the micro-rotor calibre 240. Most replicas sit between 7.5 and 8.5 mm, and hide an ordinary automatic under a decorated plate. If you cannot measure the case and cannot see the movement, you are guessing.

The real 5738, in one paragraph

The Golden Ellipse is the shape Patek built around the golden ratio, roughly 1.618 to 1. The current 5738 keeps that idea: a 34.5 x 39.5 mm elliptical case, ultra-thin, with a sunburst dial and applied baton markers. Reference 5738P-001 is platinum with a blue dial. Reference 5738R-001 is rose gold with an ebony black dial. Neither has a date. Neither has a seconds hand. That last detail matters more than people expect.

Thickness is the first thing to check

Measure it. Not with your eyes, with calipers, caseback to crystal. A real 5738 is 5.9 mm. To get there you need a movement around 2.5 mm thick, which is exactly what calibre 240 is. A Miyota 9015 based build is already 3.9 mm before you add a dial, hands, crystal and caseback. Do the arithmetic and you land near 8 mm every time.

Look at the crystal too. On the genuine watch the sapphire sits almost flush with the bezel. On many replicas it domes up and catches light at the edge. That single detail ruins the profile from across a table.

The movement question

This is where the price tiers split. Cheap copies use a basic automatic with a printed rotor. Mid-tier copies use a Miyota 9015 or a Seagull, then bolt on a fake micro-rotor plate so the back looks busy. Higher-end builds sometimes use a real micro-rotor clone, and those cost real money because the geometry is hard to machine at that scale.

Two quick checks. First, listen. A 9015 winds with an audible whir when you shake it. A 240 is near silent. Second, look at the rotor path. If the decorative plate blocks the whole movement and you can see no gears at all, that is a cover, not a micro-rotor.

Dial and hands

The blue dial on the 5738P is a sunburst that darkens toward the edges. Cheap replicas print a flat blue and call it a day; the gradient is missing or blotchy. The applied markers should be faceted, polished on the top surfaces, and sit slightly above the dial. Look at the signature. Patek prints thin, crisp lettering. Replicas usually print heavier and the spacing drifts.

Then check the functions. No date window. No small seconds. If a seller shows you a 5738 with a running seconds hand, the base movement is wrong and everything else about the watch is suspect.

Case, bracelet and markings

Platinum Patek watches carry a small diamond set into the case between the lugs at 6 o'clock. It is tiny and easy to miss, and most replicas skip it. The caseback should be engraved, not laser-etched shallow, with the reference number, the metal stamp and the appropriate hallmarks. Stamp depth is one of the fastest ways to sort a serious build from a costume piece.

The 2018 fiftieth anniversary version, ref. 5738/50P-001, came on an integrated chain bracelet in a run of 100 pieces. Replica bracelets are the weakest part of any Ellipse copy. The links are usually thicker than they should be, the taper is wrong, and the clasp feels hollow.

Weight and metal feel

Platinum is dense. Even at 5.9 mm, a platinum 5738 feels substantial in the hand for its size. Steel copies feel light and gold-plated copies feel light and slightly warm. If you have handled a real one, your hand knows before your eyes do.

Where the money goes

Under a certain price you get a flat dial, a domed crystal and an 8 mm case. Above it you start seeing correct proportions, a sunburst finish and better engraving. The jump from decent to convincing is expensive, and it is mostly spent on the movement and the case machining, not the strap.

Bottom line

Judge a fake 5738 with calipers, a loupe and a shake. Thickness, rotor behaviour, dial gradient and the absence of a seconds hand will tell you more in two minutes than any set of photos. Anyone selling one should be fine with you asking for those four things.