While bidirectional rotating bezels may be quicker for wearers to turn to the appropriate spot, as a dive bezel it’s not the best option. If the bezel gets accidentally knocked, this could cause divers to miscalculate how long they have been underwater. Therefore, a unidirectional bezel is more prudent because accidental knocks to the bezel can only result in overestimating immersion time – it’s far preferable to start ascending to the surface earlier or spend longer than necessary at a decompression stop.Rolex began equipping the Submariner with unidirectional bezels starting with the Submariner Date ref. 16800, which was introduced around 1979. The no-date Submariner model received a unidirectional bezel with the introduction of the Submariner ref. 14060 in 1990.Like the previous generation, the new unidirectional bezels included aluminum bezel inserts. In 1983, Rolex introduced the first two-tone Submariner model in the form of the Submariner Date ref. 16803, which sported a yellow gold knurled bezel with a black or blue aluminum insert. To celebrate the 40th anniversary of the Submariner in 2003, Rolex introduced the stainless steel Submariner Date ref. 16610LV with a green bezel insert.In 2008, Rolex introduced the first Submariner models equipped with unidirectional bezels featuring Cerachrom inserts. Cerachrom is Rolex’s proprietary ceramic alloy that is not only resistant to scratching but also to fading. The 60-minute graduations are cut into the bezel and then the ceramic bezel insert is fully coated with either yellow gold (for yellow gold and two-tone models) or platinum (for white gold or steel models). The gold/platinum is then polished away from the ceramic surface until only the recessed numerals and markings are left with the metal filling.By 2012, Rolex had rolled out the Cerachrom bezels across all Submariner models and color options include black, blue, and green. A quick way to know the color of the bezel is to look at the letters in the reference number: LB (blue bezel), LN (black bezel), and LV (green bezel).
Much like the red line of text on the dial of the latest Sea-Dweller, the bright orange, arrow-shaped 24-hour hand on the latest incarnation of the Rolex Explorer II is a design element directly borrowed from the very first version of the watch from 1971. For a number of decades, this style of 24-hour hand was entirely absent from the Rolex watch catalog, during which time, the Explorer II shared a 24-hour hand design with Rolex’s GMT-Master II line of watches.However, in 2011 for its 40th anniversary, the Explorer II line received a complete makeover, both inside and out. Although the vast majority of the new reference 216570 Explorer II was completely different from the original version and classifies it as an undisputedly modern timepiece, the large, orange-colored, arrow-shaped, 24-hour hand is aesthetically almost identical to the one on the original version of the Explorer II from the early 1970s.A significant part of the allure of the Rolex GMT-Master II 126710BLRO is rooted in its vintage-inspired design elements, such as its red and blue, “Pepsi” bezel insert and its Jubilee-style bracelet. The very first Rolex GMT-Master watches from the mid-1950s were made from stainless steel and fitted with half-red, half-blue bezel inserts; however, ever since the introduction of Cerachrom (ceramic) bezels, half-red, half-blue “Pepsi” bezel inserts were only available on the 18k white gold version of Rolex’s GMT-Master II. The reference 126710 GMT-Master II marked the return of a stainless steel “Pepsi” GMT, as well as the return of the Jubilee bracelet to the GMT-Master line.
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