The September 2021 refresh of the Mido Ocean Star 600 Chronometer kept the previous model’s case dimensions and made a restrained set of design and construction changes. Xavier Markl’s report described the watch as substantial but comfortable on the wrist, with a revised dial and hands, a more rigid caseback and stronger bracelet attachment. At launch, prices were EUR 1,490, CHF 1,590 and USD 1,700; Mido’s regional pages listed the black-dial model at CHF 1,690 in Switzerland and $2,020 in the United States when accessed on October 8, 2026, with both pages showing it out of stock.
What changed in the 2021 Ocean Star 600 Chronometer?
Mido unveiled the updated Ocean Star 600 Chronometer at the Red Bull Cliff Diving World Series event in Polignano a Mare in September 2021. In his report published September 26, 2021, watch journalist Xavier Markl characterized the update as a subtle evolution rather than a new case design: the dimensions remained the same as the prior version, while the dial layout and hands were revised. The blue-dial edition uses a gradient finish. Its markers combine round and rectangular shapes, with a triangle at 12 o’clock. The seconds hand has a lollipop tip, while the hour and minute hands are partially skeletonized. Markl also noted a more rigid caseback and stronger bracelet attachment as technical changes. Monochrome Watches, September 26, 2021.
How the watch wears, according to the 2021 report
Markl described the 43.5 mm watch as substantial but comfortable on the wrist. That is his published impression, not an independent wear test for this article. Its dimensions and steel construction give it a deliberately substantial diver profile, so wrist fit is worth assessing in person if you are sensitive to case diameter or height.
Specifications and references
The 2021 report covered two versions: blue dial and bezel reference M026.608.11.041.01, and black dial and bezel reference M026.608.11.051.00. The black reference remains the model shown on Mido’s current Swiss and US product pages.
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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
| Specification | 2021 report | Mido page for black reference, accessed October 8, 2026 |
|---|---|---|
| Case diameter | 43.5 mm | 43.5 mm |
| Case thickness | 14.05 mm | 14.6 mm average thickness |
| Water resistance | 600 m / 60 ATM | 60 bar / 600 m |
| Bezel and crystal | Ceramic bezel insert; sapphire crystal with anti-reflective treatment on both sides | Ceramic rotating bezel; sapphire crystal with double-sided anti-reflective coating |
| Movement | Mido Calibre 80 COSC Si / ETA C07.821 automatic; COSC-certified, silicon hairspring, 21,600 vibrations per hour | COSC certification |
| Power reserve | 80 hours | Up to 80 hours |
The thickness figures differ: Markl’s 2021 report gives 14.05 mm, while Mido’s current black-reference page gives 14.6 mm as average thickness. They are source-specific published figures and should not be treated as a single reconciled measurement. The manufacturer describes water resistance as “up to a pressure of 60 bar (600 m / 2000 ft) with screw-down crown.” Markl’s 2021 report lists a screw-down crown and caseback. Neither figure changes what the rating means: it is a specified water-resistance rating, not a recommendation to use the watch at that depth. Mido’s Swiss product page.
Movement, bracelet and diver features
The 2021 review identifies the automatic movement as Mido Calibre 80 COSC Si, based on ETA C07.821. Its silicon hairspring, COSC certification and stated 80-hour reserve are the defining technical points in the report. The current Mido page confirms COSC certification and an up-to-80-hour reserve for the black reference, but its retrieved specifications do not identify the caliber or state a helium valve. The 2021 report also notes the revised bracelet attachment and a more rigid caseback; the available specifications do not provide a separate clasp description or warranty term.
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
2021 launch price and current listed prices
Monochrome Watches reported launch prices of EUR 1,490, CHF 1,590 and USD 1,700 in 2021. Those are launch-era regional figures, not current quotes. On October 8, 2026, Mido’s Swiss page listed CHF 1,690 as recommended retail price including VAT, while the US page displayed $2,020 without a matching VAT qualifier in the retrieved page text. Both regional pages showed the black reference as out of stock at access time. These page prices and stock indicators are regional snapshots, not guaranteed transaction prices or proof of worldwide availability.
| Price context | Listed amount | Source qualification |
|---|---|---|
| 2021 launch, Europe | EUR 1,490 | Reported by Monochrome Watches in 2021 |
| 2021 launch, Switzerland | CHF 1,590 | Reported by Monochrome Watches in 2021 |
| 2021 launch, United States | USD 1,700 | Reported by Monochrome Watches in 2021 |
| Swiss Mido listing, October 8, 2026 | CHF 1,690 | Recommended retail price including VAT; black reference marked out of stock |
| US Mido listing, October 8, 2026 | USD 2,020 | Price displayed on regional page; black reference marked out of stock |
Check the relevant regional Mido page for current price and availability before making a purchase: Switzerland and United States.
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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
Who should consider the 2021 refresh?
The update is most relevant if you want a high-rated mechanical diver with an 80-hour reserve and prefer the revised hand and marker design. The blue reference offers the gradient dial described in the 2021 report; the black reference is the one currently represented on Mido’s regional product pages. Compare the 43.5 mm diameter and the two separately published thickness figures against your fit preferences, and verify local stock and pricing since the manufacturer pages can change.
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.
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
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.
