The Orient RN-AA0001B is a highly-regarded, Japanese Domestic Market (JDM) version of the popular “Kamasu” or “Mako III” diver. It is known for its incredible value, offering premium features like a sapphire crystal and a robust in-house movement at an entry-level price.
Key Specifications
- Case Diameter: 41.8mm (often referred to as 42mm).
- Crystal: Scratch-resistant sapphire crystal (a major upgrade from previous mineral glass models).
- Movement: Caliber F6922 automatic—includes hacking (stopping the second hand) and hand-winding.
- Water Resistance: 200 meters (20 bar), featuring a screw-down crown for protection.
- Calendar: Day and date display at 3 o’clock, typically with both English and Japanese Kanji options on this JDM model.
- Lug-to-Lug: Approximately 46.8mm, which allows it to fit comfortably even on smaller wrists
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