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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsNeither is a universal everyday-wear winner. The current Rolex Air-King reference 126900 gives you a 40 mm case, a distinctive black dial and a navigation-inspired minute scale. The TUDOR Black Bay One 36 reference 79640 is a more compact 36 mm option with several dial colors and a T-fit bracelet clasp. Both are rated to 100 m water resistance and offer approximately 70 hours of power reserve. Your wrist fit, dial preference and budget are the practical deciding factors.
Which models are being compared?
This comparison covers the Rolex Air-King reference 126900 and the TUDOR Black Bay One 36 reference 79640. TUDOR’s technical specifications come from its Black Bay 31/36/39/41 family, so details such as dial availability should be checked against the current regional listing.
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How do their size and dials differ?
| Feature | Rolex Air-King 126900 | TUDOR Black Bay One 36, 79640 |
|---|---|---|
| Case diameter | 40 mm | 36 mm |
| Dial | Black, with large 3, 6 and 9 numerals and a prominent minute scale | Blue, anthracite or light champagne, as listed in TUDOR’s family |
| Case and bracelet | Oystersteel case and solid-link Oyster bracelet | Stainless steel case and bracelet with polished and satin finishes |
The 4 mm diameter difference is the clearest physical distinction: the Air-King has a larger stated case diameter, while the TUDOR is the compact choice on paper. Diameter alone does not establish which will feel more comfortable. Wrist shape and lug geometry matter, so try each watch on if possible.
The Tool Desk
Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Rolex describes the Air-King’s dial as designed for navigational time readings. Its black face and prominent minute scale create a different visual character from the TUDOR’s listed color options. Which is easier to read or more appealing is a matter of personal preference.
#1 Best Overall
- Tudor Black Bay 36 Automatic Chronometer Light Champagne Dial Unisex Watch M79640-0003
What do they offer for movement, reserve and water resistance?
| Specification | Rolex Air-King 126900 | TUDOR Black Bay One 36, 79640 |
|---|---|---|
| Movement | Rolex calibre 3230, self-winding | TUDOR manufacture calibre MT5400, self-winding |
| Approximate power reserve | 70 hours | 70 hours |
| Water resistance | 100 m / 330 ft | 100 m / 330 ft |
The published power-reserve and water-resistance figures are alike. Those specifications do not, by themselves, establish how a watch will perform in every real-world situation; follow the manufacturer’s care and water-use guidance.
How do the certifications and bracelet clasps compare?
Rolex identifies the Air-King as a Superlative Chronometer and states an accuracy range of −2/+2 seconds per day after casing. TUDOR’s family lists COSC chronometer certification for calibre MT5400. These are different certification descriptions, and the available specifications do not establish which watch will be more accurate in an individual’s everyday ownership.
Rank #2
- Tudor Black Bay 36 Automatic Chronometer Blue Dial Unisex Watch M79640-0002
The bracelet adjustment systems also differ. Rolex specifies an Oysterlock clasp with an Easylink extension of approximately 5 mm; TUDOR specifies a T-fit folding clasp with a safety catch. The stated adjustment features can help inform an in-person comparison, but they do not prove that one bracelet will feel more comfortable for a particular wearer.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallWhat do the listed prices tell you?
When accessed on October 12, 2026, Rolex’s US product page displayed a price of US $8,150. A TUDOR localized collection listing displayed $4,725 for a steel Black Bay One 36; that figure is tied to a localized listing, not a universal market price. The regional basis and current availability can affect any comparison, so check local brand listings before deciding what the watches cost where you live. Displayed prices are not a guarantee of stock or of the price in a completed transaction.
Rank #3
- 41mm steel case with polished and satin finish
- Bidirectional rotatable bezel in steel with 24-hour graduated anodised aluminium disc
- Self-winding mechanical movement with 70 hour power reserve
Which watch fits your everyday priorities?
Choose the Air-King if
- You prefer a 40 mm case and the more visually prominent option on paper.
- You want the black dial with large 3, 6 and 9 numerals and a prominent minute scale.
- The Rolex’s listed price and design suit your priorities.
Choose the Black Bay One 36 if
- You prefer a 36 mm case.
- You want one of the dial colors listed for the model family: blue, anthracite or light champagne.
- The T-fit clasp feature and the lower price displayed on the cited localized listing are relevant to your decision.
Try both on if you can: the specifications make the differences clear, but they cannot settle fit or personal comfort.
Quick Recap
Best Value
- Tudor Black Bay 39 Automatic Chronometer Blue Dial Unisex Watch M79660-0002
Rank #4
- Main Material: Stainless Steel
- Case Size: 39mm Steel Case with Polished and Satin Finish
- Series: Black Bay 58
- Dial Hue: Burgundy
- Movement Type: Manufacture Calibre MT5400-U; Self-winding Mechanical Movement with Bidirectional Rotor 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.
