Top pick: the 34 mm steel-cased replica Rendez-Vous Night & Day with a sun and moon disc that completes a full rotation in 24 hours and a hand-finished dial, because it copies the two features that make the original recognizable, the day/night aperture and the proportions. The criteria that decide whether a copy is worth owning are the disc mechanism, case size and profile, dial texture and printing, movement type, and the strap and clasp.

What the Genuine Rendez-Vous Night & Day Does

The Rendez-Vous is Jaeger-LeCoultre's feminine collection, and the Night & Day references carry a rotating disc at 6 o'clock with a sun and a moon instead of a small seconds hand or a date window. That disc turns once every 24 hours, so it shows the time of day on the dial rather than tracking a second time zone or a date. The rest of the design is quiet: a rounded case with short lugs, a textured dial, and on some references a diamond-set bezel. A copy has to get the disc right, because everything else on the watch is secondary to that one moving element.

Criterion One: The 24 Hour Day/Night Disc

Look at the aperture at 6 o'clock first. A correct copy uses a printed disc that sweeps smoothly through a 24 hour cycle, with the sun crossing the aperture during daylight hours and the moon taking over after dark. The disc should sit flat under the dial, with clean edges around the opening and no gap wide enough to catch light at an angle.

Pros

• A disc that advances through a full 24 hour cycle and lands on the sun or moon in the right position relative to the hour hand.
• Crisp paint on the sun and moon shapes, with a dark blue or navy field that stays even under bright light.
• An aperture edge that is chamfered or polished so it reads as a real opening in the dial.

Cons

• A disc that jumps in fixed steps once a day, which shows the maker treated the complication as decoration.
• Faded or soft printing on the sun and moon, or a field that looks washed out next to the dial color.
• Rough aperture edges, uneven spacing, or a disc that sits visibly above the dial surface.

Criterion Two: Case Size and Wrist Proportion

The reference family is built around smaller feminine cases, most often in the 29 mm to 34 mm range, with a slim profile and lugs that curve down toward the wrist. On a 6 inch wrist, a 29 mm case reads as a dress watch and a 34 mm case reads as a daily wearer. Anything much past that changes the character of the design, because the lugs start to overhang and the dial looks stretched.

Pros

• Case thickness under roughly 10 mm, so the watch slides under a cuff without dragging.
• Lugs that curve, which keeps the case sitting flat on a narrow wrist.
• Consistent brushing on the case sides with polished bevels that follow the same line on both sides.

Cons

• A case that measures larger than the reference it copies, which is the most common size mismatch.
• Flat or straight lugs that leave a gap between the case and the wrist.
• Caseback engraving that is shallow, off center, or crowded with text that does not match the reference layout.

Criterion Three: Movement Type and Winding Feel

The genuine watch uses an in-house automatic calibre with a module that drives the 24 hour disc. Copies usually run a stock automatic movement, a modified automatic with an added disc mechanism, or a quartz movement. A quartz copy will keep time and keep the disc correct, but the case tends to be thinner and the seconds hand ticks. An automatic copy gives you the sweep and the weight on the wrist, and it is the version most buyers look for.

Pros

• A smooth sweep on the seconds hand and a rotor you can feel turn when the watch is handled.
• Crown action with light, even resistance and no grinding at the end of the wind.
• Timekeeping that stays within a few seconds a day in normal use.

Cons

• A rotor that spins loosely or rattles, which points to a cheap bearing.
• A crown that needs force to set or feels gritty when you pull it out.
• Large daily rate swings, which mean the movement needs regulation or replacement.

Criterion Four: Dial Texture, Printing, and Bezel Setting

The genuine dials use textured finishes, including guilloché patterns and sunray brushing, with applied numerals and polished hands. Under a loupe, the printing should be sharp with no ink bleed, and the applied markers should catch light along a polished edge. If the bezel is diamond set, check that the stones sit level and that the metal around them is finished, not left rough.

Pros

• A dial texture that shifts as you tilt the watch, which shows a real stamped or machined surface.
• Applied markers with a polished top edge and clean feet, and hands with a bevel down the center.
• Stones set in a straight line at an even height, with no gaps or glue visible at the edges.

Cons

• A flat printed dial that imitates texture in two dimensions.
• Painted markers instead of applied ones, or hands that look stamped and flat.
• Stones that sit crooked, catch on fabric, or leave rough metal around the setting.

Criterion Five: Strap, Clasp, and Daily Durability

The Rendez-Vous look depends on a slim leather strap that tapers to a small buckle, often alligator or calf with a matching lining. A copy rarely fails on the strap alone, but the hardware is where the details show. The buckle should be solid, the tang should line up with the holes, and the spring bars should sit tight in the lugs.

Pros

• A strap that tapers and holds its shape, with stitching that runs straight along both sides.
• A solid buckle with a clean polish and no burrs on the tongue.
• Quick release or standard spring bars that seat fully, with no play in the lugs.

Cons

• A stiff, uniform strap with plastic edge coating that cracks within weeks.
• A hollow stamped buckle that bends under light pressure.
• Loose spring bars, which is a fit problem rather than a wear problem and can be fixed by a jeweler.

Which Version to Choose for Which Wearer

For daily wear with a mix of office and evening use, choose the 34 mm automatic with a textured dial and a plain polished bezel, and budget for a replacement strap in the first year. For a dress watch that sees a few evenings a month on a narrow wrist, the 29 mm case on a slim alligator strap keeps the original proportions and sits better under a sleeve. If you want the diamond-set look for occasional wear, treat the setting quality as the deciding factor and inspect the bezel in person or in close-up photos before buying, because that is the detail that separates a convincing copy from an obvious one.