The Tudor Black Bay S and G GMT (Ref. 79833MN) is one of those watches that looks even better the more you actually wear it. Not just because it picks up little signs of life, but because it’s a proper “do everything” GMT with real character. The warm two-tone vibe gives it a slightly dressier edge than the steel versions, while the Black Bay shape still keeps it firmly in the sporty camp.
And that’s exactly why straps matter here. This reference can look rugged, refined, or quietly flashy depending on what you put it on. Get the strap right and the whole watch snaps into focus.
Strap size and fit on the 79833MN (read this before you order)
Your Tudor Black Bay S and G GMT 79833MN is a 41mm case, and it uses a 22mm lug width. That 22mm part is the one that catches people out, because many Tudors look similar on screen but don’t share the same lug width across the range.
When you’re on Helvetus product pages, the key thing is the model selection. For this watch, you must choose Black Bay GMT as the option. Not “Black Bay” in general, not something close, not a guess. Select Black Bay GMT so you get the strap made to sit right with the case shape and proportions.
If you’re the type who buys once and wants it to feel correct immediately, this is the detail that prevents the annoying “almost fits” situation.
The best strap choices for the Black Bay S and G GMT
The 79833MN has a black dial with gold accents and that familiar Black Bay GMT presence. It’s bold without screaming, and it can swing casual or elevated depending on how you wear it. That makes it a perfect candidate for a clean rubber strap, especially if you want comfort and a sharper silhouette than the factory bracelet.
Black (classic and slightly mean in the best way)
A straight black rubber strap is the safe choice, but on this watch it’s also the smartest. It leans into the black dial, trims down the visual weight of the 41mm case, and lets the gold details do their thing without competing for attention. If you wear this watch as an everyday GMT, black is the “never wrong” pick. It also works ridiculously well with simple outfits, because the two-tone case already brings enough personality.
Black strap link:
Black Tudor Black Bay Strap
Black/Blue LuxLine® (the subtle upgrade that feels modern)
This one is for people who like the idea of color, but don’t want a loud strap. The blue line gives the watch a slightly cooler, more contemporary edge, and it plays nicely with the black dial. On the wrist, it reads more “intentional” than a plain black strap, without turning the watch into a fashion piece. It’s a great choice if you travel a lot and want the watch to feel a bit more current, especially with casual looks.
Black/Blue LuxLine® link:
Black/Blue LuxLine Tudor Black Bay Strap
Black/Red LuxLine® (sporty, confident, and surprisingly wearable)
Red can sound aggressive on paper, but on the 79833MN it works because the watch already has warmth from the gold. The red line adds energy and makes the GMT feel more “tool watch” again, almost like you’ve pulled it back toward the sporty side of the Black Bay family. This is the strap I’d pick when you want the watch to feel fun: weekends, travel days, summer evenings. It gives the watch presence without needing a loud dial.
Black/Red LuxLine® link:
Black/Red LuxLine Tudor Black Bay Strap
If you want to browse beyond these three, you’ll find more color options here (and it’s the easiest way to compare the vibe quickly):
Tudor Black Bay Rubber Strap
Buying the right strap from Helvetus (so it actually fits the way you expect)
The reason I keep repeating the selection step is simple: Tudor’s Black Bay family is full of watches that look close enough online to trick you. For the Tudor Black Bay S and G GMT 79833MN, you’re aiming for a strap that matches the case shape properly and sits cleanly at the lugs, in 22mm, with the product option set to Black Bay GMT.
If you’re unsure about color, start with black and live with it for a week. Then add a LuxLine® option when you want to change the mood of the watch without changing the watch itself. That’s the addictive part.
And if you want to see every available shade for this lineup, the Tudor Black Bay straps collection page is the fastest shortcut:
Straps for all Tudor Black Bay Models
Closing thoughts
The 79833MN is a rare kind of Tudor: it feels substantial, slightly luxurious, and still built like it wants to be worn hard. Pair it with a strap that’s designed to fit this specific Black Bay GMT case, and the watch becomes even more comfortable and more “yours” day to day. That’s the point.
With Helvetus, you’re getting something that’s built for this exact model’s proportions, backed by a lifetime warranty, shipped free worldwide, and set up so you don’t get hit with import costs. It’s also not a tiny niche thing anymore, which matters for trust: over 30,000 customers worldwide have already gone down this rabbit hole.
