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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →On the listed prices cited here, the Tudor Black Bay GMT costs several times more than the standard Christopher Ward C63 Sealander GMT. That premium brings a larger case, higher stated water resistance, COSC certification and a longer stated power reserve. Whether those differences justify the extra spend depends on your fit, priorities and preference for Tudor—not on the specifications alone.
This comparison is between the 41mm steel-bracelet Tudor Black Bay GMT reference M79830RB-0001 and the updated standard C63 Sealander GMT configuration reviewed by T3 in July 2026. Prices and specifications can vary by configuration and market.
| # | Preview | Product | Price | |
|---|---|---|---|---|
| 1 |
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Tudor Heritage Black Bay GMT Stainless Steel Automatic Mens Watch M79830RB-0001 | $4,650.00 | Buy on Amazon |
| 2 |
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Tudor GMT 58 Black Bay | $5,449.98 | Buy on Amazon |
| 3 |
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TUDOR Black Bay 58 GMT | $5,550.00 | Buy on Amazon |
| 4 |
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Tudor Black Bay Automatic Black Dial GMT Pepsi Bezel Men's Watch 79830RB-0002 | $4,900.00 | Buy on Amazon |
| 5 |
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Tudor Black Bay Automatic Chronometer Black Dial Men's Watch M79833MN-0001 | $7,499.99 | Buy on Amazon |
How much more does the Tudor cost?
Tudor’s European product page lists the steel-bracelet Black Bay GMT at €4,900. T3’s July 2026 review reports £1,190 / €1,560 / US$1,620 / AU$2,195 for the standard C63 configuration it reviewed. These are not a like-for-like market price check: the figures come from different sources and may reflect different taxes, configurations and purchase conditions. Tudor describes its prices as suggested retail and says they may change; check current local pricing for both watches before buying. Tudor’s Black Bay GMT product page · T3’s July 2026 C63 review.
The cited euro prices put Tudor €3,340 above the reviewed C63, but that arithmetic is only a comparison of those two reported figures—not a guaranteed checkout-price difference. The C63 price is for one reviewed configuration, not a verified price list for every size, dial, strap or market.
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- 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
What does the premium buy on paper?
| Specification | Tudor Black Bay GMT M79830RB-0001 | Standard C63 Sealander GMT, reviewed configuration |
|---|---|---|
| Case diameter | 41mm (Tudor product specification) | 39mm (T3, July 2026) |
| Thickness | 14.6mm (Tudor product specification) | 11.3mm (T3, July 2026) |
| Water resistance | 200m (Tudor product specification) | 150m (T3, July 2026) |
| Movement and credential | Manufacture Calibre MT5652; COSC-certified (Tudor product specification) | Sellita SW330-2; no COSC certification stated in T3’s reviewed specifications |
| Power reserve | Approximately 70 hours (Tudor product specification) | At least 50 hours (T3, July 2026) |
| Stated accuracy | Not stated on the cited Tudor product page | -5/+12 seconds per day (T3, July 2026) |
| Listed price cited here | €4,900 suggested retail for the steel-bracelet reference on Tudor’s accessed European page | £1,190 / €1,560 / US$1,620 / AU$2,195 for T3’s reviewed configuration in July 2026 |
These are manufacturer- or reviewer-published specifications, not results from a comparative accuracy test. Tudor’s page also identifies a burgundy-and-blue 24-hour bezel, domed sapphire crystal and 22mm lug width for this reference. The size figures suggest the Tudor is both wider and thicker, but dimensions alone cannot establish which watch will feel better on your wrist; try them on if fit is decisive. Neither water-resistance figure, by itself, establishes that a watch is suitable for every form of diving.
Are the GMT functions different?
Yes. Do not assume the standard C63 Sealander GMT has the same setting behavior as the separately named C63 Sealander True GMT. The standard C63 reviewed by T3 uses a Sellita SW330-2; Fratello describes earlier standard C63 SW330-2 versions as caller-style GMTs. Fratello’s earlier C63 coverage concerns earlier variants, so its figures should not be carried over as current specifications.
Rank #2
- Tudor Black Bay 58 GMT "Coke" Automatic 39mm Black Dial Men's Watch M7939G1A0NRU-0001
Christopher Ward’s manual instructs the wearer to set local hour and minute time, then set the GMT hand to home time on the 24-hour bezel. Tudor’s instructions describe a reference-time hand and a setting sequence in which setting reference time also moves the conventional hour hand. Follow the instructions for the exact reference rather than relying on a broad label such as “traveller GMT.” Christopher Ward’s C63 manual · Tudor’s Black Bay GMT instructions and product information.
The C63 Sealander True GMT is a distinct model with a different movement and a substantially higher price than the standard C63. Its specifications and price are not substitutes for the standard Sealander GMT figures in this comparison. C63 True GMT coverage.
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- Tudor Black Bay 58 GMT "Coke" Automatic Black Dial Men's Watch M7939G1A0NRU-0002
Which one makes more sense for you?
Choose the C63 if value and a slimmer profile lead
- You want to spend substantially less than the cited Tudor retail price, while checking current prices for your market and preferred configuration.
- A 39mm, 11.3mm-thick case appeals more than the Tudor’s 41mm, 14.6mm dimensions.
- The reviewed model’s 150m water resistance and minimum 50-hour reserve meet your needs, and COSC certification is not a deciding requirement.
Choose the Tudor if its specific advantages matter to you
- You value its COSC-certified manufacture movement and approximately 70-hour stated reserve.
- You prefer its larger case and want the higher stated 200m water resistance.
- You specifically want the Tudor design and brand proposition enough to accept the substantial price difference.
Those are decision criteria, not proof that either watch is more reliable, more accurate in everyday use, or better at holding value. No comparative test or market data cited here establishes those claims. Finishing, brand preference and perceived prestige are personal judgments; they cannot be settled by the specification sheet.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Verdict: is Tudor worth the premium?
The Tudor is worth paying more for if its COSC certification, longer stated reserve, 200m water resistance, larger proportions and brand appeal matter enough to you to justify the extra cost. If your priorities are a slimmer, smaller watch and a much lower cited price, the standard C63 Sealander GMT makes the more compelling value case on these specifications. The evidence supports a clear difference in price and features, not a universal winner.
Quick Recap
Best Value
- Tudor Black Bay GMT S&G Automatic Chronometer Black Dial Men's Watch M79833MN-0001
Rank #4
- Tudor Black Bay Automatic Black Dial GMT Pepsi Bezel Men's Watch 79830RB-0002
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.
