Housed in a 40mm white gold case, this JLC Master Ultra Thin Tourbillon replica pushes the line into haute horlogerie territory. White gold provides a cooler, denser presence on the wrist than stainless steel, and the slightly larger 40mm diameter gives the tourbillon aperture at six o’clock more room to breathe. The caliber is automatic rather than hand-wound: a clone of the genuine Cal. 978, beating at 28,800 vph and holding 42 hours of reserve against 45 hours on the original. The result is a dress watch that happens to contain one of the most visually dramatic complications in mechanical watchmaking.

Build Details

• Case diameter: 40mm
• Case material: white gold
• Complication: tourbillon visible at six o’clock
• Crystal: sapphire with anti-reflective coating
• Functions: hours, minutes, tourbillon
• Movement: clone Cal. 978, automatic, 28,800 vph
• Power reserve: 42 hours (genuine Cal. 978: 45 hours)
• Strap: leather with white gold buckle

White gold looks similar to steel in photographs but feels noticeably heavier in hand. That density translates to a weighted, substantial wrist presence that steel at the same dimensions cannot deliver.

What Collectors Notice

The 40mm sizing is one millimeter larger than most Ultra Thin Master references, and that extra space changes the visual balance around the tourbillon window. Collectors pay attention to the cage rotation speed, the finishing on the bridge holding the tourbillon, and whether the aperture frame integrates cleanly with the dial surface. Jaeger-LeCoultre has built tourbillons for decades, and the carriage here is the part of that work you can actually watch turn. For more from this family, explore our Ultra Thin Master collection. The 1362511 Moon 39 replica sits one step down in complication: a 39 mm pink gold case with a moon phase and date ring in place of the rotating cage, which makes it a useful baseline for what the tourbillon adds.

This vs Other Versions

Compared to the other tourbillon in this collection, which pairs a pink gold case with a blue guilloché dial, the white gold version takes a more restrained visual path. The dial stays clean and unadorned, letting the tourbillon cage and the metal itself carry the statement. If you want the tourbillon experience delivered through material quality rather than decorative craft, this Master Ultra Thin super clone is the reference that prioritizes substance over surface.

White gold in a 40mm case is as far as this line goes, and the two Ultra Thin Master tourbillons and the simpler references around them are listed together for a direct comparison with the pink gold guilloché version. The honest version of that calculation is what a white gold JLC super clone is actually worth.

Specifications

• Model: Jaeger-LeCoultre Master Ultra Thin Tourbillon
• Case: white gold
• Case size: 40 mm
• Dial: plain and undecorated, with an open tourbillon aperture at six o’clock
• Complications: tourbillon
• Movement: clone Cal. 978, automatic, 28,800 vph
• Power reserve: 42 hours (genuine Cal. 978: 45 hours)
• Water resistance: 50 m (same as genuine)
• Crystal: sapphire
• Strap: alligator leather with pin buckle