The Rolex Sea-Dweller 116660, a watch synonymous with deep-sea exploration and robust reliability, underwent a subtle yet significant evolution during its production run. Collectors and enthusiasts often distinguish between two primary "marks" – the Mark 1 (MK1) and the Mark 2 (MK2) – each possessing unique characteristics that set them apart. This article will delve into the key differences between these two iterations, examining the subtle details that make identifying and appreciating them a rewarding pursuit. We will also briefly touch upon how the 116660 compares to its successor, the Sea-Dweller 43 (126600), particularly focusing on the 126600 Mark 1.
Identifying the Rolex 116660 MK1 and MK2: The Telltale Signs
As noted by resources such as WatchProSite, discerning the MK1 from the MK2 116660 isn't overly complex once you know what to look for. The primary differences lie in the subtle variations of the dial text and the crown markings. These seemingly minor alterations significantly impact the overall aesthetic and are the key identifiers for collectors.
* The Coronet: The most prominent difference between the MK1 and MK2 lies in the depiction of the Rolex coronet. The MK1 boasts a significantly shorter coronet, appearing more compact and less pronounced compared to the longer, more extended coronet found on the MK2. This difference is readily apparent when comparing side-by-side images or even directly examining the watches.
* The "Depth" Text: Close inspection of the "MAXIMUM DEPTH - 1220 METRES - 4000 FEET" text reveals another crucial distinction. The letter "f" in "feet" is noticeably smaller on the MK1 dial compared to the MK2. This minute detail, while seemingly insignificant, is a consistent and reliable marker differentiating the two versions. The overall font style and spacing might also exhibit minor differences, although these are less consistently reliable than the coronet and "f" size.
* Production Ranges: While precise serial number ranges are not publicly released by Rolex, general estimations suggest the MK1 was produced from the beginning of the 116600's production until approximately serial number range 8,000,000 (circa). The MK2 followed, continuing production until the model was superseded by the Sea-Dweller 43. It's crucial to understand these are approximations, and variations exist. Using serial numbers alone for definitive identification isn’t always reliable, making dial examination paramount.
Beyond the Dial: Other Potential Variations (Though Less Reliable)
While the coronet and "f" in "feet" are the most reliable indicators, other subtle variations have been noted by keen-eyed collectors. These, however, are less consistent and should be used with caution in identification:
* Hand Style: Some collectors claim slight differences in the hand styles between MK1 and MK2, but this isn't universally agreed upon and is less reliable than the dial variations.
* Lume: While both versions utilize Super-LumiNova, some anecdotal evidence suggests slight variations in the hue or intensity of the lume, though this is highly subjective and difficult to objectively verify.
* Case Back Markings: While unlikely to be a primary identifier, there might be minor differences in the case back engravings between early and later production runs, but again, this is less reliable than the dial details.
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