Rolex GMT-Master II vs Tudor Black Bay GMT

Both are GMT watches in the premium tier. In short: the Tudor Black Bay GMT takes more water (200m) — both are fine for swimming, but it has more margin if you dive. The Rolex GMT-Master II is automatic, 100m water resistance, 40mm, sapphire crystal; the Tudor Black Bay GMT is automatic, 200m water resistance, 41mm, sapphire crystal.

Last verified 2026-06-27 · specs from manufacturer data · tier = price band, confirm the live price at the retailer

Spec	Rolex GMT-Master II	Tudor Black Bay GMT
Movement	Automatic	Automatic
Water resistance	100m	200m
Case size	40mm	41mm
Crystal	sapphire	sapphire
Style	GMT / travel	GMT / travel
Price tier	Premium	Premium

Which should you buy?

The Tudor Black Bay GMT takes more water (200m) — both are fine for swimming, but it has more margin if you dive.

Where to buy

Rolex GMT-Master IISee price on AmazonCheck price

Tudor Black Bay GMTSee price on AmazonCheck price

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FAQ

What's the difference between the Rolex GMT-Master II and the Tudor Black Bay GMT?
Both are GMT watches in the premium tier. The Rolex GMT-Master II is automatic, 100m water resistance, 40mm, sapphire crystal; the Tudor Black Bay GMT is automatic, 200m water resistance, 41mm, sapphire crystal.

Which has better water resistance, the Rolex GMT-Master II or the Tudor Black Bay GMT?
The Tudor Black Bay GMT, rated 200m, versus 100m on the other. Pick 100m or higher for swimming and 200m+ for diving.

Which is better value, the Rolex GMT-Master II or the Tudor Black Bay GMT?
Both sit in the premium tier, so it comes down to movement, water resistance and case size — see the spec table above.

Citing these specs? Go ahead — manufacturer data, last verified 2026-06-27. Copy a ready-made reference:

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