If you have read a Heritage Chrono strap guide and it told you to stay away from blue, that guide was about the other one.
The 70330B is the Chrono Blue, and everything that makes the grey-and-black 70330N a dark, orange-accented watch is reversed here. Light dial, blue bezel, blue dial contour — and the orange is still there, doing something completely different against it. To see every option side by side, browse our Tudor watch straps.
Strap size and fit guide
Your Tudor Heritage Chrono Blue (Ref. 70330B) has a 42mm case and a 22mm lug width, on standard spring bars, with a lug-to-lug of roughly 51mm.
That is the same case as the grey-and-black 70330N, so the fit answer is identical across both Heritage Chronos. The Heritage Chrono is a discontinued line and is not a named option in our Tudor range, so order 22mm from any of our universal ranges — ordinary lugs, ordinary spring bars, nothing unusual to work around.
One thing worth flagging on the fit: reviewers who have handled this watch note it wears larger than 42mm because of its wide-spaced and long lugs. That is not a width issue, but it does mean a strap that tapers noticeably will look better balanced than one that runs full width to the buckle.
Checklist: 42mm case, 22mm lugs, standard spring bars.
Three colours, and none of them are optional
Most watches give you one accent to work with. This one gives you three, and they are all locked into the design:
- The bezel carries a blue anodised aluminium disc with a 12-hour scale
- The dial is opaline — a light cream-silver — with a blue contour surrounding the registers and the outer minute track
- On that blue contour sit orange Arabic numerals every five minutes, and the central chronograph hand is a large orange sweep
That is Tudor rebuilding the 1970s Montecarlo palette — the reference 7169 was sold with a blue and grey dial, and this is the modern reading of it. Sotheby's described it accurately when the watch came up at auction: a 1970s colour scheme of blue and opaline with vibrant orange accents.
And here is the thing that makes this watch different to strap: the dial is light.
Every other Tudor worth writing about has a dark dial, and on a dark dial a dark strap continues the watch — the case, the dial and the strap read as one object. On an opaline dial, a black strap does the opposite. It creates a hard line at the lugs, chops the watch into three bands, and makes a light dial look like it is floating on something unrelated.
So the rule here is not the usual one. Mid-tones work, warm neutrals work, and blue works because the watch is already blue. Hard black is the one thing to think twice about — which is exactly the reverse of the advice for the 70330N.
Worth knowing what Tudor themselves did: some 70330B references shipped on a blue, grey and orange fabric strap. Rather than picking one of the three colours, Tudor used all of them. That tells you this watch tolerates a busier strap than its black-dialled sibling ever could.
The best straps for the Chrono Blue
Denim — the hero, and the most obvious idea nobody has. Denim is blue, textured, and unmistakably of the same era the watch is quoting. It picks up the bezel disc and the dial contour without the flat, dead quality a plain blue leather has against an opaline dial, and — the part that actually sells it — orange against denim is one of the great colour pairings. The chronograph hand sweeps across a blue dial contour and lands on a blue strap, and the whole watch finally reads as one idea rather than three. If you own the Chrono Blue because of how it looks, this is the strap for it. Denim Watch Straps — choose 22mm
Tan or cognac leather — the warm mid-tone. The safest good answer. Warm brown sits between the opaline dial and the orange accents without competing with either, and it avoids the hard edge that black creates against a light dial. It is also the most versatile of the four: a 42mm chronograph in cream and blue is already doing plenty, and a quiet strap lets it. Mid-tan for summer, cognac for a richer look with the blue. Leather Watch Straps — choose 22mm
Grey suede — the period-correct one. The original Montecarlo 7169 was a blue and grey watch, and grey is the colour the modern re-edition quietly dropped. Bringing it back on the strap is the most historically literate thing you can do here. Suede rather than smooth leather, because a matte surface against a light opaline dial and a polished steel case gives the eye somewhere to settle — smooth grey leather can look flat, suede does not. This is the connoisseur's answer. Suede Leather Watch Straps — choose 22mm
Sailcloth — the one to actually wear. The Chrono Blue has 150m of water resistance and screw-down pushers, so it is more capable than its colours suggest. Sailcloth gives you a technical woven texture that suits a racing chronograph, handles weather far better than leather, and stays neutral enough not to add a fourth colour to a dial that already has three. If the denim is the weekend strap and the tan is the everyday, this is the one for everything else. Sailcloth Watch Straps — choose 22mm
Everything else is here: All General Straps
Getting the order right
42mm, 22mm, standard spring bars. Choose 22mm in whichever range suits you — no model selection required.
If you own other Tudors:
- Tudor Black Bay Chrono 79360N Strap Guide — the modern Tudor chronograph, 41mm and also 22mm
- Tudor Black Bay 41 Blue 79230B Strap Guide — 41mm, 22mm
- Tudor Black Bay Ceramic 79210CNU Strap Guide — 41mm, 22mm
FAQ
What lug width is the Tudor Heritage Chrono Blue? 22mm, on a 42mm case. The same as the grey-and-black 70330N — both Heritage Chronos share a case.
Is the Chrono Blue the same watch as the 70330N? Same case, same width, same layout. The difference is entirely colour: the 70330N has a black or grey dial with a steel bezel, while the 70330B has an opaline dial with a blue contour and a blue anodised bezel disc. Both carry orange chronograph accents.
Should I avoid blue straps on it? No — that advice belongs to the 70330N, which has no blue anywhere. On the Chrono Blue, blue is a defining colour of the watch and a blue strap references it directly.
Why not black? The dial is light. A black strap against an opaline dial creates a hard line at the lugs and splits the watch visually, where on a dark-dialled watch it would continue it. Mid-tones and warm neutrals sit better.
Did it come with a strap from Tudor? Some references shipped on a blue, grey and orange fabric strap — Tudor's own answer to a three-colour dial was to use all three.
Final thoughts
The Chrono Blue is the most colourful thing Tudor has made in the modern era and the one that most rewards a considered strap. Get it wrong and you have four colours arguing. Get it right and it is a 1970s racing chronograph that looks like it was assembled by someone with a plan.
Helvetus carries 22mm across denim, leather, suede and sailcloth, so every route in this guide is available. Shipping is free worldwide with no import costs, leather straps carry a one-year warranty and every rubber strap a lifetime warranty, and more than 50,000 customers have already made the swap.
