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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →The black Mido Ocean Star Decompression Worldtimer, reference M026.829.17.051.00, pairs a 40.5 mm steel case with an automatic GMT/date movement, a stated reserve of up to 80 hours and manufacturer-rated water resistance of 20 bar (200 m/660 ft). Its GMT uses a 24-hour hand and matching bezel to show a second time zone; the “Decompression” name does not mean it calculates dive decompression. Here are the specifications, practical trade-offs and strap details to check before buying.
What the black M026.829.17.051.00 offers
Mido’s current US listing identifies this exact reference as a special-edition Ocean Star Decompression Worldtimer with a 316L stainless-steel case, sapphire crystal with anti-reflective coating on the underside, automatic movement, date and GMT functions. The listed dimensions and performance figures below are manufacturer specifications, not results from an independent test.
| Specification | Mido’s listing |
|---|---|
| Case diameter | 40.5 mm |
| Average thickness | 13.4 mm |
| Case material | 316L stainless steel |
| Crystal | Sapphire, anti-reflective coating on the underside |
| Movement | Automatic; Mido’s European catalogue identifies Caliber 80 for the model |
| Functions | Date and GMT |
| Maximum stated power reserve | Up to 80 hours |
| Stated water resistance | Up to 20 bar (200 m/660 ft), with a screw-down crown |
| Lug width | 21 mm, listed by Mido France |
| Black rubber strap reference | M603018678, listed by Mido |
How the GMT display works
Mido describes the GMT as a second-time-zone display: an additional hand makes one full rotation every 24 hours, and the bezel is graduated over 24 hours. Read that hand against the bezel to track a second time zone while the ordinary hour and minute hands show local time. This is a conventional GMT-style arrangement, not an independently adjustable world-time display of multiple cities. Mido lists a date function as well.
The product name’s “Worldtimer” label should not be taken to mean the watch automatically displays every world time zone. Mido’s description of this reference explains a second time zone through the 24-hour hand and bezel.
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#1 Best Overall
- Swiss Made Watch
- Movement: Automatic MIDO caliber with GMT function and Date calendar - Power reserve 80 hours
- Case Type: Diver-style stainless steel case with black rotating bezel - Capable of withstanding pressures of up to 20 bar (200 m/660 ft), and equipped with a screw-down crown, this diver watch offers optimal protection against water.
- Case Size: 40.5mm - Case Thickness: 13.43mm - Decompression worldtimer design black dial offering hand and indexes filled with Super-Luminova - Crystal: Glassbox-style sapphire crystal.
- Band Type: Stainless steel milanese bracelet with sliding clasp Additional rubber strap with pin buckle closure included- Lug Width: 21mm
What the size and water-resistance figures mean in practice
Case dimensions
At 40.5 mm across, the case is not an oversized 44–45 mm watch, but the diameter alone cannot predict fit: wrist shape, lug-to-lug length and strap curvature also matter, and the cited product specification does not state lug-to-lug length. The listed average thickness is 13.4 mm, a consideration if you wear close-fitting shirt cuffs.
Water resistance
Mido rates the watch up to 20 bar (200 m/660 ft) and specifies a screw-down crown. That rating is the manufacturer’s stated specification; it is not an independent test result here, and it does not make this watch a dive computer. The available product description establishes watch functions, not decompression calculations, dive-planning capability or a replacement for diving instruments.
Rank #2
- Swiss Made Watch
- Movement: Automatic MIDO caliber with GMT function and Date calendar - Power reserve 80 hours
- Case Type: Diver-style stainless steel case with blue rotating bezel - Capable of withstanding pressures of up to 20 bar (200 m/660 ft), and equipped with a screw-down crown, this diver watch offers optimal protection against water.
- Case Size: 40.5mm - Case Thickness: 13.43mm - Decompression worldtimer design blue dial offering hand and indexes filled with Super-Luminova - Crystal: Glassbox-style sapphire crystal.
- Band Type: Stainless steel milanese bracelet with sliding clasp Additional rubber strap with pin buckle closure included- Lug Width: 21mm
Automatic movement and the 80-hour reserve
Mido states a power reserve of up to 80 hours. “Up to” is the manufacturer’s maximum specification, not a guarantee that every watch will run for exactly that long under all conditions. If the watch is stopped, it will need to be wound and set again; the listed reserve provides useful leeway between wear periods, but does not remove the need to keep the watch running or reset the time and date as needed. Mido’s 2023 European catalogue identifies Caliber 80 for this edition.
Strap, package and the blue alternative
Mido lists a 21 mm lug width and the black rubber strap reference M603018678. Its US product page marks the black reference as a special edition with one additional strap included. Check the seller’s exact package contents before purchase rather than assuming that every listing includes the same extra strap.
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Rank #3
- Swiss Made Watch
- Movement: The MIDO Caliber 80 represents a major advance in self-winding movements. Thanks to its new-generation technology, it offers up to 80 hours of power reserve
- Case Type: Stainless steel - Capable of withstanding pressures of up to 20 bar (200 m/660 ft), and equipped with a screw-down crown
- Case Size: 40.5mm - Case Thickness: 13.4mm - Retro Style Red-and-Black Chequered Dial with Day,Date Calendar - Wordtimer bezel design - Crystal: Sapphire crystal
- Band Type: Black leather Strap with red stitching, paired with a bund-style black leather strap. Pin Buckle closure - Band Width: 21mm
Mido France lists optional 21 mm leather, fabric and rubber straps. Regional accessory listings and availability can differ; confirm the exact strap reference and fit for your watch configuration before ordering. The related blue-dial reference is M026.829.17.041.00. Mido’s 2023 European catalogue lists both black and blue references as special editions. Compare the actual package and strap offered, not just the dial color. Prices shown on Mido’s French site are regional and should not be treated as prices for other markets.
Price and availability
Mido’s US listing showed a price of $1,490 and “currently out of stock” when crawled about three weeks before October 8, 2026. Both the price and stock status may have changed; check Mido’s live listing or a seller’s current product page before deciding. A retailer search result for this exact reference is not, by itself, proof of live inventory or authorized-seller status.
Rank #4
- 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
Who should consider this reference?
- Consider it if you want a black-dial Ocean Star with a dedicated 24-hour GMT hand, a 40.5 mm case and a long manufacturer-stated reserve.
- Check carefully if you need a thinner watch, want an independently verified performance result, or are buying an alternate strap: thickness, testing and exact accessory compatibility matter to those decisions.
- Look elsewhere if you need actual dive-computer or decompression-planning functions; the cited product specifications do not establish those capabilities.
For direct specifications and current product status, see Mido’s US page for the black M026.829.17.051.00. Regional strap options and the blue variant are listed on Mido France’s product page; the model’s special-edition status and Caliber 80 identification appear in Mido’s 2023 European catalogue.
Quick Recap
Best Value
- 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.
