Rolex steel GMT Master Case, Bezel and missing back. Model # 16570 – Serial # N230xxx ,



  1. Material: The case is crafted from high-quality stainless steel, a corrosion-resistant and robust material commonly used in luxury watchmaking. Rolex is known for its meticulous attention to detail in finishing stainless steel, resulting in a polished and refined appearance.
  2. Size: The case size is typically around 40mm in diameter, offering a balanced and versatile size that fits well on various wrist sizes. The thickness of the case is moderate, contributing to a comfortable wearing experience.
  3. Shape: The case shape is likely to be round, which is a classic and timeless design favored by Rolex. The lugs, where the bracelet attaches to the case, are well-defined but not overly elongated, maintaining a harmonious aesthetic.
  4. Crown missing: The watch features a screw-down crown, providing water resistance to the timepiece. Rolex is renowned for its robust and secure crown systems, ensuring protection against water infiltration.
  5. Crystal: The crystal covering the dial is made of scratch-resistant sapphire, enhancing the watch’s durability and clarity. The crystal may have a Cyclops lens over the date window, a characteristic feature of many Rolex models.
  6. Bezel: The Explorer II 16570 might have a fixed stainless steel bezel with a 24-hour scale. This feature is particularly useful for the GMT function, allowing the wearer to track a second time zone.
  7. Back Case Missing:



  1. Automatic Movement: The Caliber 1570 is an automatic or self-winding movement, meaning it is powered by the motion of the wearer’s wrist.
  2. Date Function: Many watches equipped with the Caliber 1570 feature a date window with the Cyclops lens for magnification.
  3. Jewel Count: The movement likely has a jewel count of around 26 or 27 jewels, which helps reduce friction and enhance the overall durability and accuracy of the movement.
  4. Frequency: The movement operates at a frequency of 19,800 vibrations per hour (vph), providing a smooth and accurate timekeeping experience.