The 2021 Mido Ocean Star 600 Chronometer was a subtle update to the brand’s large, steel professional-style diver. The black-dial steel-bracelet version covered here is reference M026.608.11.051.00. Mido specifies a 43.5 mm case, 600 m water resistance and an automatic COSC-certified Caliber 80 with a silicon balance spring and up to 80 hours of power reserve. Those are manufacturer specifications, not independent test results.
What changed in the 2021 Ocean Star 600 Chronometer?
Mido introduced the updated Ocean Star 600 Chronometer at a Red Bull Cliff Diving event. Monochrome described the release as a new version with subtle updates, but the available launch coverage does not establish a complete, item-by-item comparison with the preceding model. It is safer to treat 2021 as the update’s launch context than to assume every specification was new.
The current official product listing identifies the black-dial steel-bracelet watch as reference M026.608.11.051.00. Mido’s current page is the clearest source for its detailed specifications; it should not be read as proof that every detail changed in 2021. Monochrome’s 2021 launch coverage describes the update and its introduction.
Specifications for reference M026.608.11.051.00
| Specification | Mido listing |
|---|---|
| Case | 316L stainless steel; 43.5 mm wide; 14.6 mm average thickness |
| Crystal | Sapphire, with antireflective coating on both sides |
| Crown | Screw-down |
| Dial | Black |
| Bezel | Rotating bezel with ceramic ring; Mido specifies Super-LumiNova Grade X on the bezel |
| Water resistance | 60 bar / 600 m; Mido’s descriptive copy also says approximately 1,968 ft, while its technical listing rounds this to 2,000 ft |
| Movement | Automatic Caliber 80 Chronometer; COSC certification; silicon balance spring; day and date; up to 80 hours of power reserve |
| Bracelet and clasp | Grey stainless-steel bracelet; folding clasp with safety lock, diver extension and double push-buttons |
| Lug width | 22 mm |
| Weight | 219 g |
| Warranty | Five years, as listed by Mido |
These are Mido’s published specifications for the named reference, not measurements or performance tests conducted independently. See Mido’s international product page for the official listing.
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- Movement: Automatic Mido Caliber - Power reserve 80 hours - COSC Certified
- Case Type: Stainless steel and ceramic bezel - Screw-down crown
- Case Size: 43.5mm - Band Width: 22mm - Case Thickness: 14.55mm
- Crystal: Sapphire crystal with double sided anti-reflection treatment
- Strap: Stainless steel bracelet - Folding clasp with diving extension
What the size means for fit
At 43.5 mm across, 14.6 mm thick on average and 219 g, this is a substantial watch on paper. Its 22 mm lug width is useful when checking replacement straps, but width alone does not establish compatibility: attachment type and end-link geometry also matter. Mido lists bracelet/strap reference M605017383.
Whether the case feels balanced or sits comfortably depends on the wearer and wrist; the published dimensions cannot settle that. Trying the watch on is the most reliable way to judge fit.
Rank #2
- Movement: COSC-Certified Automatic Mido Caliber 80 Chronometer SI with silicon balance spring. In addition to its non-magnetic properties, it offers greater precision and improved shock resistance. This caliber ensures exceptional autonomy of up to 80 hours.
- This Swiss-made MIDO timepiece, designed to withstand the extreme pressures of the deep sea, is exceptionally water-resistant to 60 bar (600 m/1968 ft). Equipped with a helium valve, it guarantees safe decompression during extended dives.
- Case Type: Stainless steel with ceramic bezel and Sapphire crystal with double sided anti-reflection treatment - Screw-down crown.
- Case Size: 43.5mm - Band Width: 22mm (Tapered) - Case Thickness: 14.55mm
- Strap: Tapered Stainless steel bracelet - Folding clasp with diving extension
Movement and dive-watch construction
Caliber 80 Chronometer
Mido identifies the automatic movement as Caliber 80 Chronometer and says it has a silicon balance spring, COSC certification, day-and-date functions and up to 80 hours of power reserve. Mido describes the silicon balance spring as a feature of its “next-generation MIDO Caliber 80 Chronometer movement.” The certification and reserve are manufacturer-stated specifications; they are not a report of accuracy or reserve measured for this article.
Case, bezel and water resistance
Mido rates the watch at 60 bar / 600 m and specifies a screw-down crown, helium valve, rotating ceramic bezel and sapphire crystal with antireflective coating on both sides. These construction details and the depth rating come from the manufacturer. A depth rating by itself does not establish suitability for every dive or replace appropriate equipment and training; the presence of a helium valve likewise should not be taken as a general benefit for ordinary recreational diving.
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- Swiss Made Watch
- Movement: Automatic Mido Caliber - Power reserve 80 hours - COSC Certified
- Case Type: Stainless steel with black DLC coating and ceramic bezel - Screw-down crown
- Case Size: 43.5mm - Band Width: 22mm - Case Thickness: 14.55mm
- Crystal: Sapphire crystal with double sided anti-reflection treatment
Price and availability
When checked in 2026, Mido’s international listing showed CHF 1,690 including VAT, and its US listing showed $2,020. Both pages displayed out-of-stock notices at that time. These are regional manufacturer page prices, not confirmed transaction prices, and a stock notice does not establish that the watch is unavailable everywhere or discontinued. Check the relevant regional listing for current status.
The Mido US product page lists the same reference and provides a notification option, a Macy’s shop link and a store finder. Those links do not establish availability through any other retailer.
Rank #4
- Swiss Made Watch
- Movement: Automatic Mido Caliber - Power reserve 80 hours
- Case Type: Stainless steel with blue ceramic bezel - Capable of withstanding pressures of up to 20 bar (200 m/660 ft), and equipped with a screw-down crown, this watch offers optimal protection against water.
- Case Size: 42.5mm - Case Thickness: 12.25mm - Blue wave design dial with individually applied indexes coated with white Super-Luminova - Crystal: Sapphire crystal with double sided anti-reflection treatment
- Band Type: Stainless Steel Bracelet - Folding Clasp with Diving Extension - Band Width: 22mm
Who should consider this version?
The published specification makes the black-dial Ocean Star 600 Chronometer a candidate for someone seeking a large steel watch with a high stated water-resistance rating, a ceramic rotating bezel, a chronometer-certified automatic movement and an extended stated power reserve. Its substantial dimensions and 219 g listed weight are important practical considerations, while actual wrist fit remains personal. No direct competitor comparison or independent performance test is established here, so a value or accuracy ranking would go beyond the available evidence.
Keep this reference distinct from blue-dial and other Ocean Star 600 versions when checking specifications, prices or stock. Mido’s official pages establish this product and reference, but not its availability on any specific third-party marketplace.
Quick Recap
Best Value
- Swiss Made Automatic Watch
- Movement: Automatic Movement Mido Caliber 72 - With 72 hours of power reserve and nivachron balance spring
- Case Type: 316L Stainless steel diver style with screw-down crown and unidirectional rotating bezel
- Case Size: 39mm - Band Width: 20mm - Case Thickness: 10.5mm - Sapphire crystal with double sided anti-reflection treatment
- Band: Satin-finished stainless steel bracelet and folding clasp with diver’s extension, with polished centre link bevels, MIDO quick-change system.
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.
