Reference 1663406 brings an open-worked tourbillon to the Master Collection, and this replica master control tourbillon puts that complication on full display through a large aperture at six o’clock. The exposed tourbillon cage rotates once per minute, counteracting positional timing errors that affect conventional escapements, while the rest of the dial retains the Master Control family’s signature clean layout with minimal text and applied indices. It is a fundamentally different proposition from the simpler time-and-date pieces in this range, elevating the collection into haute horlogerie territory with a single complication window.

Build Details

• Case diameter: 40mm
• Case material: stainless steel with polished bezel
• Dial: silver-white with tourbillon aperture at 6 o’clock
• Crystal: sapphire front with anti-reflective coating and exhibition caseback
• Strap: alligator leather with folding buckle
• Movement: automatic tourbillon
• Functions: hours, minutes, tourbillon visible at 6

The 40mm case gives the tourbillon cage enough real estate to be visible without pushing the dial into busy territory. Through the exhibition caseback the finishing of the bridges, beveling, and rotor decoration is fully exposed, adding visual interest from both sides of the wrist. The dual-side sapphire crystal approach means the movement is never hidden.

What Collectors Notice

Tourbillons in this segment separate the display pieces from the daily wearers. The 1663406 leans toward the former, though the 40mm steel case and automatic winding keep it practical enough for regular rotation rather than permanent safe storage. Jaeger-LeCoultre has historically produced its tourbillon cages and escapements in-house, a distinction that collectors value when comparing across different manufactures. For a less complicated entry point in the same family, consider the Ultra Thin 39mm with black dial, which focuses entirely on slim proportions and essential timekeeping without any visible complication. Both live within the Master Control range, representing opposite ends of the complication spectrum.

This vs Other Versions

Most Master Control references emphasize restraint and quiet elegance. The 1663406 breaks that pattern deliberately by making the movement itself the primary visual focal point of the dial. If you want the Master Control case language and brand DNA but need something that commands attention and sparks conversation, the tourbillon delivers on both counts. This replica master control tourbillon presents the complication without sacrificing the refined proportions that define the broader collection.