Rolex
Deepsea
136668LB
Deep-diving engineering meets 18k yellow gold in the blue-dialled 136668LB.
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Overview
The Rolex Deepsea reference 136668LB represents the convergence of the Sea-Dweller line's extreme-depth engineering heritage with the prestige of solid 18k yellow gold. Introduced in 2024, it pairs a 44mm yellow gold case with a blue dial, positioning it as one of the most technically ambitious precious-metal dive watches in the modern Rolex catalogue. Beneath its luxurious exterior, the watch retains the full professional-grade architecture that defines the Deepsea family.
History
The Deepsea line evolved from Rolex's long-standing Sea-Dweller programme, which has pursued saturation-diving performance since the late 1960s. The Deepsea designation itself marks a significant step up in water-resistance capability, underpinned by the proprietary Ringlock System that reinforces the case against extreme pressure. The introduction of the 136668LB in 2024 extended this technical platform into yellow gold for the first time in the modern Deepsea era, broadening the model's appeal to collectors who prize both horological performance and precious-metal craftsmanship.
Notable points
- The 44mm case is crafted entirely in 18k yellow gold, a rare material choice for a watch engineered to professional diver specifications.
- The blue dial creates a striking visual dialogue with the warm tone of the yellow gold case, a combination with strong precedent in Rolex's precious-metal sport references.
- Calibre 3235 is a Rolex in-house movement featuring the Chronergy escapement, a paramagnetic nickel-phosphorus lever and escape wheel, and a 70-hour power reserve.
- The Deepsea case architecture incorporates the Ringlock System — a nitrogen-alloyed steel ring, domed sapphire crystal, and solid caseback — engineered to withstand pressures far beyond recreational diving demands.
- Reference 136668LB entered production in 2024, making it among the most recent additions to the Sea-Dweller family at the time of its introduction.
