Rolex Sea-Dweller 1665

The Rolex Sea‑Dweller ref. 1665, often called the “Double Red” or “Great White,” was produced from 1967 to 1983, marking Rolex’s inaugural entry into saturation diving timepieces. Engineered with a 40 mm stainless steel case, helium‑escape valve and rated to 610 m (2,000 ft), it merged professional-grade performance with iconic mid‑century styling. Today, 1665 holds an esteemed position among collectors due to its historical importance, technical breakthroughs, and striking vintage appeal.

Technical Specifications

Detailed Overview
Unveiled in 1967, the Sea‑Dweller 1665 evolved from saturation diving prototypes and the Submariner line. Rolex addressed helium buildup issues encountered during decompression by patenting and installing a helium‑escape valve—a world-first in dive watches. Initially issued to professionals, it entered the public catalog around 1971. Its 40 mm steel case housed a robust Cal. 1575 movement and was fitted with a domed acrylic crystal for added depth resistance.

The early “Single Red” proto‑1665s gave way to the famed “Double Red Sea‑Dweller” (DRSD), featuring two lines of red text: “SEA‑DWELLER” and “SUBMARINER 2000.” Produced until roughly 1977, the DRSD remains highly prized among collectors. Post‑1977 models adopted white text exclusively—earning the nickname “Great White”—and signaled Rolex’s full commitment to the Sea‑Dweller as a distinct model line. Several dial generations emerged during this period, classified as Mark 0 through Mark IV, with the “rail dial” Mark II being especially coveted.

Despite sharing a 40 mm diameter with the Submariner, the 1665 is significantly thicker—approximately 17 mm hooded by the tall acrylic crystal and thick back, giving it a commanding wrist presence. The case back displays prominent engravings noting the helium‑escape valve and depth rating, signaling its professional credentials.

Historical and Cultural Significance
The 1665 was Rolex’s response to the needs of saturation divers and their work in hyperbaric environments, such as those at COMEX. The helium‑escape valve was a technical breakthrough that redefined dive watch functionality. During the DRSD era, Rolex still shared Submariner branding on the dial, but post‑1977 models affirmed Sea‑Dweller’s independence—conveyed visually by the white text and omission of “Submariner.” The 1665 was the last Sea‑Dweller to feature a plexiglass crystal, anchoring its vintage identity before the transition to sapphire with later models like the 16660.

Today, the 1665 is recognized as one of Rolex’s most historically significant dive watches. Experts categorize it among the top Rolex models for its technical innovation and cultural impact. The DRSD variants command $50,000 +, while “Great White” versions typically range from $30,000 to $55,000, depending on dial condition and provenance. COMEX branded or special‑order Middle Eastern dials can reach six‑figure prices. Market liquidity remains strong; well‑preserved examples are often sought after.

Variations

• Proto/Single‑Red Mark 0: Very rare; single red “SEA‑DWELLER” text, helium‑escape valve, early domed crystal.
• Double Red Sea‑Dweller (Mark I–III): Two red text lines, with subtle dial-font and detail variations across “Marks.”
• Great White (Mark 0–IV): All-white text after 1977; includes “rail dial” (Mark II) and refined case back engraving.
• COMEX and Co‑branded: SEA‑DWELLER dials featuring COMEX logo; extremely scarce and collectible.
• Special Orders: Rare Middle Eastern dials with symbols such as “Khanjar” or “Qaboos.”

Current Market Context
As of mid‑2025, the Sea‑Dweller 1665 is highly sought, balancing professional heritage with rugged charm. It continues to appreciate, especially for DRSD and rare “rail dial” Great Whites. Strong demand, limited supply, and cultural influence all support its value trajectory. Collectors regard it not merely as a vintage Rolex but a landmark in dive‑watch evolution.

Conclusion
The Rolex Sea‑Dweller 1665 is a landmark in the Crown’s history: a true saturation diver’s instrument that spearheaded helium‑escape valve innovation and fortified Rolex’s dive‑watch leadership. Its visual presence, technical pedigree, and collectible variations ensure its place in serious collections. With its unique character and technical achievements, the 1665 remains a compelling proposition for vintage watch enthusiasts and seasoned collectors alike, and its significance is only growing over time.