The Rolex 1665 Double Red Sea-Dweller (DRSD) is a highly sought-after collector's piece, renowned for its robust build and dive-ready functionality. However, within the world of the 1665, a subtle yet significant distinction exists: the "thin case" versus the "thick case." This seemingly minor variation holds considerable weight for collectors, impacting both the watch's aesthetic and its historical significance. Understanding this difference is crucial for anyone considering purchasing a 1665, or for simply appreciating the intricacies of Rolex's production history.
Thin Case 1665 DRSD:
The earliest examples of the Rolex 1665, particularly those produced in the late 1960s and early 1970s, are often referred to as "thin case" models. Crucially, these watches didn't utilize a case specifically designed for the Sea-Dweller. Instead, Rolex adapted the existing case of the Submariner 5513, adding the Helium Escape Valve (HEV) necessary for saturation diving. This is a key differentiator – the 5513 case, while robust, was not initially intended for the higher pressure capabilities expected of a professional dive watch like the Sea-Dweller. The resulting "thin case" 1665 therefore exhibits a slightly more slender profile compared to its later counterpart.
The use of the 5513 case for the early 1665's is a testament to Rolex's pragmatic approach to manufacturing. By adapting existing components, they could quickly bring the Sea-Dweller to market, meeting the growing demand for a professional-grade dive watch capable of handling the extreme pressures encountered during saturation diving. This expediency, however, resulted in a watch that, while functional, lacked the dedicated design features that would later characterize the "thick case" versions. This explains why some thin case 1665s may show signs of wear or even slight case deformation more readily than thicker case models. The inherent design limitations are a factor to consider for collectors.
Phong 1665 'Thin Case' DRSD:
The term "Phong" is often associated with certain "thin case" 1665 DRSDs, usually referring to watches that have undergone restoration or modification. While not an official Rolex designation, it's used within the collector community to refer to watches that may have had their cases refinished or replaced, potentially obscuring their original condition. This makes authentication and proper grading significantly more challenging. A truly original, unrestored "thin case" 1665 is highly prized among collectors for its historical authenticity. Therefore, it's essential to conduct thorough research and, ideally, seek expert opinion before purchasing a Phong 1665, to avoid potential misrepresentation or disappointment. The provenance and history of a 1665 are crucial aspects in determining its value and desirability.
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