Rolex Deepsea 136660 44mm D-blue

The Rolex Deepsea 136660 44mm D-blue (Reference 136660) is an extreme-depth professional dive watch from the renowned Rolex Deepsea collection, engineered to conquer the immense hydrostatic pressures of saturation ocean exploration while offering commanding luxury wrist presence for everyday enthusiasts. Built with a commanding 44 mm (1.73 inches) Oyster case and a total thickness of 17.7 mm (0.70 inches), this reference represents the zenith of deep-sea horological architecture, bridging vintage submarine heritage with modern high-performance engineering.

The optical signature of this timepiece is anchored by its d-blue two-tone gradient dial transitioning from twilight ocean blue to abyss black with vibrant green "deepsea" lettering, protected beneath an ultra-thick 5.5 mm (0.22 inches) domed synthetic sapphire crystal. Large geometric hour markers and classic Mercedes hands are filled with high-grade luminescence, emitting a vibrant long-lasting blue glow in dim conditions. Framing the dial is a slimmer profile unidirectional rotatable 60-minute cerachrom ceramic bezel with recessed platinum graduations, featuring knurled outer edge teeth that provide secure tactical grip during adjustment. The inner bezel ring showcases the Ringlock System inscription, underscoring the structural compression architecture engineered for abyssal depths.

Beneath the grade 5 titanium caseback secured by a threaded steel compression ring beats a robust automatic self-winding mechanical movement with updated gear train (calibre 3235 base, 28,800 vph), oscillating at 28,800 vibrations per hour (4 Hz) to deliver a fluid, steady seconds sweep. The movement incorporates a bidirectional Perpetual rotor that winds the internal mainspring through natural wrist motion, alongside an instantaneous quickset date mechanism positioned at 3 o'clock that advances cleanly at midnight. Integrated stop-seconds hacking halts the balance wheel immediately when the screw-down Triplock crown is unscrewed to position 3, allowing synchronization down to the exact second.

Securing the timepiece to the wrist is a solid 904l / 316l stainless steel 3-link oyster bracelet with oysterlock safety clasp and glidelock fine-adjustment system, engineered with solid curved links, satin-brushed top surfaces, and mirror-polished case flanks. The folding Oysterlock safety clasp prevents accidental opening, while the integrated Rolex Glidelock mechanism allows wearers to fine-tune bracelet length in 2 mm (0.08 inches) increments without tools. The flush helium escape valve integrated on the 9 o'clock flank honors the technical requirements of commercial deep-sea saturation diving, while comprehensive gasket seals safeguard the internal movement against everyday dust, humidity, and water splashes.

Each timepiece undergoes multi-point electronic timegrapher rate testing, gasket pressure verification, and visual macro inspection prior to dispatch. Orders are packaged in discreet protective containers and shipped via express insured courier with full door-to-door tracking and adult signature verification. Every purchase is protected by our comprehensive 24-month mechanical warranty covering movement functionality, supported by dedicated concierge customer care for complete peace of mind.