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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsThe Orient Star 75th-anniversary M42 Diver 1964 1st Edition F6 Date 200m is reference RE-AU0503N, a 700-piece limited edition with a blue-grey gradation dial. It pairs design cues from Orient’s first diver’s watch with a modern automatic movement and a stated 200 m scuba-diver’s water-resistance rating.
What is the RE-AU0503N?
Orient Star announced the anniversary model on February 4, 2026, with an official launch in March 2026. The brand describes it as a reinterpretation of the 1964 Olympia Calendar Diver and limits production to 700 pieces worldwide. Epson’s Japanese announcement specifies 400 pieces for Japan and 300 for overseas markets; those are regional allocations, not separate global edition totals. Orient Star’s announcement and Epson’s announcement provide the release details.
The dial is blue-grey, graduating from a lighter centre to a darker perimeter. Orient Star says the effect is intended to evoke the ocean reflecting stars at night. The watch also has a rotating bezel, luminous elements, a date display and a power-reserve indicator. Orient Star’s product page lists the full specification.
Movement and everyday operation
The watch uses Orient Star’s F6N47 mechanical calibre. It winds automatically or by hand and has a stated power reserve of over 50 hours. Orient Star lists accuracy at +25 to -15 seconds per day; that is the manufacturer’s specification, not a guarantee that every watch will keep time within that range in every wearing condition.
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- Orient F6922 Automatic / Hand-Winding / Hacking Movement
- Case Diameter: 41.5 mm | 47 mm Lug to Lug Length | 22 mm Lug Width | 13 mm Thick
- Features: Day | Date | 120-Click Unidirectional Bezel | Screw-down Crown
- Stainless Steel Case | Mineral Crystal
- Water Resistant 200m (660ft): in General, Suitable for Professional Marine Activity and Serious Surface Water Sports, but not Diving
The power-reserve indicator lets the wearer see the remaining reserve on the dial. A date display adds a practical complication, while the screw-down crown and screw case back are part of the sealed case construction.
Case, bracelet and fit
| Specification | RE-AU0503N |
|---|---|
| Case width | 41.0 mm |
| Case height | 49.6 mm |
| Thickness | 14.5 mm |
| Weight | 179 g |
| Bracelet width | 20 mm |
| Listed wrist size | 140–200 mm |
The case and bracelet are SUS316L stainless steel. Orient Star specifies a dual-curve sapphire crystal with anti-reflective coating, and a trifold deployant buckle with push button and security latch. The 41.0 mm width is only one part of the fit: the listed 49.6 mm case height and 14.5 mm thickness also affect how the watch wears, and its stated weight is 179 g. Try it on if possible, particularly if you prefer compact or lightweight divers.
Rank #2
- Powered by the Orient F922 Automatic / Hand-Winding / Hacking Movement
- Case Dimensions: 41.8 mm Diameter, 47 mm Lug to Lug Length, 12.8 mm Thick, 22 mm Lug Width
- Feature: Sapphire Crystal, Day, Date, Screwdown Crown, 120-Cliick Unidirectional Bezel
- Dial Color: Red
- Water resistant 200m (660ft): in general, suitable for professional marine activity and serious surface water sports, but not diving
What the 200 m diver rating means
Orient Star specifies 200 m scuba-diver’s water resistance and says the model complies with international ISO 6425 standards. The product page also lists JIS Type 1 magnetic resistance of 4,800 A/m or higher. These are manufacturer-published specifications; follow the watch’s instructions for operation and care, especially before exposing it to water.
The 200 m rating belongs to this modern anniversary watch. It should not be attributed to the 1964 original: Orient Star lists the Olympia Calendar Diver at 40 m and says that it does not meet current ISO diver-watch standards. The brand explains that clear standards for diver’s watches did not exist when the original was made. See Orient Star’s 75th-anniversary history.
Rank #3
- Powered by the Orient F6722 Automatic, Hand-Winding and Hacking Movement
- 39.9mm Case Diameter (46.5mm lug to lug)
- 20mm Lug Width
- Sapphire Crystal
- Water resistant 200m (660ft): in general, suitable for professional marine activity and serious surface water sports, but not diving
How it relates to the 1964 Olympia Calendar Diver
Orient identifies the Olympia Calendar Diver as its first diver’s watch. The RE-AU0503N reworks that heritage in a current mechanical watch; it is not a reproduction of the original’s water-resistance capability. The contemporary specification, including the ISO-compliant 200 m diver rating, is a key distinction between the two.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.RE-AU0503N versus the silver-dial RE-AU0502S
The anniversary RE-AU0503N is not simply a blue-grey colorway of the earlier silver-dial RE-AU0502S. Orient Star lists different launch timing, edition counts and case widths.
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- Set Includes: Main unit, box,
- Drive Type: Mechanical (self-winding, hand-winding)
- Time accuracy: +25 seconds to -15 seconds per day
- Operation time: 50 hours or more (with power reserve indicator)
- Country of Origin: Japan (Made in Japan)
| Model | Dial | Launch | Edition | Listed case width |
|---|---|---|---|---|
| RE-AU0503N | Blue-grey gradation | March 2026 | 700 pieces | 41.0 mm |
| RE-AU0502S | Silver | February 2023 | 900 pieces | 40.2 mm |
Specifications for RE-AU0502S are on its separate Orient Star product page. The reference number matters when comparing listings or looking for the anniversary edition.
Availability and remaining specifications
The official materials establish the model’s 700-piece production run and March 2026 launch, but do not establish a current price or present-day stock at any particular retailer. Availability may differ by market; verify the reference number and seller’s listing before buying.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchOrient Star lists a three-year warranty and Japan as the country of origin. The official specification also includes 22 jewels. The brand notes that technical improvements can change specifications without notice and that product images and colors may differ from the actual watch. Check the current official listing for the latest details.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
