Rolex Deepsea Black Dial Ref#136660‑0004

🔹 Overview

The Rolex Deepsea 44 mm Ref. 136660‑0004 stands as one of the most formidable diving watches ever created, a product of decades of Rolex’s commitment to excellence in professional-grade timepieces. Designed to withstand the extreme pressures of the ocean’s abyss, this watch is not simply water-resistant — it is engineered to perform at an incredible depth of 3,900 meters (12,800 feet), thanks to the brand’s groundbreaking Ringlock System.

Crafted entirely from Oystersteel, a superalloy known for its exceptional corrosion resistance, and complemented by a grade‑5 titanium caseback, the Deepsea offers both ruggedness and comfort. Its unidirectional black Cerachrom bezel insert is virtually scratchproof and allows divers to precisely track immersion time, while the engraved platinum-coated numerals ensure clarity and durability.

The striking black dial exudes a purposeful, tool‑watch aesthetic. Its oversized hour markers and Mercedes‑style hands are filled with Chromalight, a proprietary luminescent material that emits an intense blue glow for up to eight hours — more than double the duration of standard luminescent materials. This ensures that legibility is never compromised, even in the darkest depths.

The Oyster bracelet, also in Oystersteel, features Rolex’s Oysterlock safety clasp with the Glidelock extension system for micro-adjustments of up to 20 mm, and a Fliplock extension link to fit securely over a wetsuit, making it as practical as it is luxurious.

💎 Key Specifications:

• Origin: Switzerland

• Gender: Men’s / Unisex

• Case Diameter: 44 mm

• Case Material: Oystersteel (904L stainless steel) with grade‑5 titanium caseback

• Bezel: Unidirectional rotatable, 60‑minute graduated; black Cerachrom ceramic insert with platinum-coated numerals

• Dial: Black with Chromalight luminescent display

• Hour Markers: 18 ct white gold applied markers filled with Chromalight; Mercedes-style hands with blue luminescence

• Bracelet Type: Oyster bracelet in Oystersteel; Oysterlock clasp, Glidelock extension, Fliplock link

• Glass: 5.5 mm‑thick domed sapphire crystal (no Cyclops lens)

• Water Resistance: 3,900 m / 12,800 ft; helium escape valve; Triplock crown

⏱️ Movement:

• Type: Perpetual, mechanical, self-winding, Superlative Chronometer (–2/+2 sec/day after casing)

• Caliber: Rolex Calibre 3235, in‑house manufacture

• Power Reserve: ~70 hours

• Frequency: 28,800 vph

• Jewels: 31

• Hairspring: Blue Parachrom hairspring with Paraflex shock absorbers

Functions:

• Central hours, minutes, and seconds

• Instantaneous date at 3 o’clock with rapid‑set

• Stop‑seconds for precise time setting

✅ Extended Highlight Summary

The Rolex Deepsea Black Dial is more than a watch — it is a professional-grade diving instrument designed for those who dare to go deeper. Every aspect of its construction has been considered with precision: the Ringlock System allows the case to resist pressure at depths greater than most submarines; the Chromalight display ensures optimal legibility in the pitch-black conditions of the deep ocean; and the Cerachrom bezel insert resists fading even after prolonged exposure to UV rays and saltwater.

This model carries the DNA of Rolex’s legendary dive watches, but pushes the boundaries of engineering and endurance further than ever before. Powered by the Calibre 3235, a movement renowned for its precision, shock resistance, and long power reserve, the Deepsea offers both uncompromising performance and refined craftsmanship.

Whether worn over a wetsuit on a deep‑sea expedition or paired with a suit in the boardroom, the Deepsea Ref. 136660‑0004 commands attention. It is a statement piece for those who respect the ocean’s extremes and value the ultimate in horological innovation.