The Oyster case was an innovation of its time when it was developed by Rolex in 1926. It ushered in a brand new era of durable, everyday watches that could be worn during almost any activity without damaging the internal movement. The Submariner takes the design of the Oyster case one step further and increased its waterproofness up to 300 meters/1,000 feet.The ref. 16613 features a standard 40mm case in highly corrosion-resistant 904L stainless steel. An 18 karat yellow gold screw-down crown and unidirectional bezel accompany the case, giving it a desirable two-tone design. The dial and bezel set are most commonly available in either black or blue, with some examples of the gem-set “Serti” dial (either champagne or silver in color and set with diamonds and blue sapphires) also available on the secondary market. Depending on the year produced, the ref. 16613 also features either a holes or no holes case and either Tritium or LumiNova used for the luminescence on the dial and hands.Regardless of the year of production, all two-tone Rolex 16613 Submariner watches are powered by Rolex’s trusty Caliber 3135 automatic movement. The 31-jewel movement beats at a rate of 28,800bph and includes a date complication, a 48-hour power reserve, automatic winding technology, and a sophisticated Breguet overcoil balance-spring. The movement has been a fixture in many Rolex wristwatches for more than three decades, and for a good reason. The Cal. 3135 has proven itself to be an accurate and robust movement, which can deliver decades of reliable performance if properly maintained.
Black dial has a micro-sand finish, there are two small dials, like the two eyes of owl. Small second hand is running on the subdial at 9 o’clock. The subdial at 3 o’clock now works the same way as genuine watch, there are two hands on that subdial, the longer hand is displaying minutes chronograph, while the shorter hand is hour-chronograph pointer. The movement has been modified by OM factory, so the minute and hour chronograph could be completely achieved on this replica watch.Black nylon strap may be the best match for this watch. The texture of the black nylon band is exactly in line with the black matt finish of the watch. On the back side of the band, the side that touches your skin, is made of genuine leather. I tried this type of band on my hand, it maintains the soft wearing comfort of full genuine leather band, but also looks very cool due to its black nylon material on outside.
