Tudor Black Bay 31 S&G · Ref. M79603-0008 · 17mm lug · 31mm case
At a Glance
| # | Best For | Strap | Material | Price |
|---|---|---|---|---|
| 1 | Overall / First Purchase | Black Epsom Slim Strap | Epsom Calfskin | $110 |
| 2 | Dressy / Formal | Matte Himalayan Alligator Signature Strap | Alligator | $205 |
| 3 | Everyday / Casual | Grigio Pueblo Slim Strap | Pueblo Calfskin | $110 |
| 4 | Minimalist / Refined | Black Shell Cordovan Slim Strap | Shell Cordovan | $165 |
| 5 | Casual / Relaxed | Brown Waxy Slim Strap | Waxy Leather | $110 |
| 6 | Active / Sporty | Natural Babele Slim Strap | Babele Calfskin | $110 |
| 7 | Comfort / Wildcard | Navy Shell Cordovan Slim Strap | Shell Cordovan | $165 |
✓ No import fees — delivered duty-free✓ Lifetime warranty✓ Ships globally from USA, UK & Singapore
Some dials you glance at. The Tudor Black Bay 31 S&G (ref. M79603-0008) is one you study. Its silver dial with applied hour markers, snowflake hands and date window at 3 o'clock. The 17mm lug width might not be the most common, but the options are deeper than you would expect.
The 31mm case with its 11.3mm profile gives you just enough wrist presence to anchor different strap materials without the watch disappearing. Here are my 7 picks — and why each one works.
The 17mm lug width means your options are curated but well-covered. Already know what you're looking for? Browse all Tudor Black Bay 31 S&G-compatible straps on the Strap Finder →
Swipe to browse all 7 picks →
1. Best Overall — Black Epsom Slim Strap
Your first strap upgrade should feel like an obvious improvement. This one does.
The Black Epsom Slim Strap features Epsom leather, tanned by Haas. The fine, uniform grain gives it a clean, contemporary look that resists scratches and moisture with ease. This is leather that looks as sharp six months from now as it does on day one. At 2.2mm thick, it balances presence and wearability nicely.
The Tudor Black Bay 31 S&G's 31mm case is ideally proportioned for this strap. The dress watch aesthetic is enhanced by the refined strap construction. It is the kind of pairing where both the watch and strap look better together than apart.
2. Best Dressy — Matte Himalayan Alligator Signature Strap
There's dressy, and then there's refined. This strap lands squarely in refined territory.
The Matte Himalayan Alligator Signature Strap is crafted from genuine alligator leather — not embossed calfskin, the real thing. Each scale pattern is unique, and the matte finish gives it a refined presence that catches light without being flashy. The leather is supple from the start with minimal break-in needed. At 4.5–2.2mm thick, it balances presence and wearability nicely.
The Tudor Black Bay 31 S&G's 31mm case is ideally proportioned for this strap. The dress watch aesthetic is enhanced by the refined strap construction. It is the kind of pairing where both the watch and strap look better together than apart.
3. Best Everyday — Grigio Pueblo Slim Strap
The strap you reach for without thinking — that's what an everyday pick should be.
The Grigio Pueblo Slim Strap features Buttero leather from the Walpier tannery in Italy. This vegetable-tanned leather develops one of the most beautiful patinas in watchmaking — scratches blend into the surface and the colour deepens over time. If you enjoy watching your strap age gracefully, this is the one. At 2.2mm thick, it balances presence and wearability nicely.
What makes this pairing work on the Tudor Black Bay 31 S&G is the contrast — the refined case finishing against the texture creates visual interest without conflict. With a 31mm case, the proportions stay balanced.
A combination that's greater than the sum of its parts.
4. Best Minimalist — Black Shell Cordovan Slim Strap
Minimalism isn't about doing less. It's about doing exactly what's needed.
The Black Shell Cordovan Slim Strap is crafted from premium materials with careful attention to detail and construction quality. At 2.2mm thick, it balances presence and wearability nicely.
Paired with the Tudor Black Bay 31 S&G's distinctive dial, this strap elevates the overall look without competing for attention. The 11.3mm case thickness means a padded strap like this one feels proportional and substantial.
It's the kind of pairing that makes you wonder why you didn't try it sooner.
5. Best Casual — Brown Waxy Slim Strap
Weekend straps should feel effortless. This one nails that.
The Brown Waxy Slim Strap features waxy pull-up leather with a rich, oily finish that shifts and lightens with wear. The resulting patina is what leather enthusiasts live for — a lived-in character that cannot be replicated by any other material. At 2.2mm thick, it balances presence and wearability nicely.
The Tudor Black Bay 31 S&G's 31mm case is ideally proportioned for this strap. The dress watch aesthetic is enhanced by the refined strap construction. It is the kind of pairing where both the watch and strap look better together than apart.
Once you see it on the wrist, it just clicks.
6. Best Sporty — Natural Babele Slim Strap
Not every sporty strap needs to be water-resistant — sometimes it is about the texture and attitude.
The Natural Babele Slim Strap features Buttero leather from the Walpier tannery in Italy. This vegetable-tanned leather develops one of the most beautiful patinas in watchmaking — scratches blend into the surface and the colour deepens over time. If you enjoy watching your strap age gracefully, this is the one. At 2.2mm thick, it balances presence and wearability nicely.
Paired with the Tudor Black Bay 31 S&G's distinctive dial, this strap elevates the overall look without competing for attention. The 11.3mm case thickness means a padded strap like this one feels proportional and substantial.
The kind of strap that earns a permanent spot in your rotation.
7. The Wildcard — Navy Shell Cordovan Slim Strap
Think of this as the strap you didn't know you needed.
The Navy Shell Cordovan Slim Strap is crafted from premium materials with careful attention to detail and construction quality. At 2.2mm thick, it balances presence and wearability nicely.
The Tudor Black Bay 31 S&G's 31mm case is ideally proportioned for this strap. The dress watch aesthetic is enhanced by the refined strap construction. It is the kind of pairing where both the watch and strap look better together than apart.
The kind of strap that earns a permanent spot in your rotation.
A Note on Buckle Colour
Quick but important: always match your buckle to your case. The Tudor Black Bay 31 S&G's Stainless steel with 18k yellow gold bezel, crown and centre bracelet links case calls for a gold buckle to match. All Delugs leather straps ship with a pin buckle and can be upgraded to a Spring Deployant Clasp for extra security and convenience. All Delugs straps come with quick-release spring bars pre-installed, so swapping straps takes seconds.
How to Change the Strap on Your Tudor Black Bay 31 S&G
Swapping straps on the Tudor Black Bay 31 S&G is one of the easiest upgrades you can make — and with Delugs straps, you don't even need a tool.
All Delugs straps come with quick-release spring bars already pre-installed, so changing straps is completely tool-free. Here's how:
- Prepare your workspace. Lay the watch face-down on a soft cloth or microfiber pad to protect the caseback from scratches.
- Release the spring bar. Locate the small lever on the quick-release spring bar. Pull it back with your fingernail or fingertip to compress the bar.
- Remove the strap. While holding the lever, angle the strap out from between the lugs. Repeat for the other side.
- Insert the new strap. Slide one end of the spring bar into the lug hole. Pull the lever on the quick-release spring bar knob, guide the entire spring bar into the opposite lug hole, and then release the knob. You should hear a small click when the spring bar extends and seats into the lug hole.
- Check the fit. Give the strap a gentle tug to make sure both spring bars are securely locked in. If there's any play, reseat the spring bar.
The entire process takes under a minute once you get the hang of it — no spring bar tool required. The Tudor Black Bay 31 S&G uses a standard 17mm lug width, and all Delugs straps in 17mm will fit perfectly.
Frequently Asked Questions
What is the lug width of the Tudor M79603-0008?
The Tudor M79603-0008 has a 17mm lug width. While 17mm is less common than 20mm, there is still a strong selection of quality straps available. All Delugs straps are available in 17mm.
What is the reference number for the Tudor Black Bay 31 S&G?
The reference number for the Tudor Black Bay 31 S&G is M79603-0008. You can find this on the caseback of your watch or on the original paperwork. Knowing your reference number helps ensure you get the right lug width when ordering a strap.
Can I use rubber or casual strap on the Tudor Black Bay 31 S&G?
Absolutely. While the Black Bay 31 S&G leans dressy, pairing it with a rubber or casual leather strap opens it up for everyday and weekend wear. Many collectors find that a nubuck or waxy leather strap transforms a dress watch into a versatile daily wearer without losing its character.
Do Delugs straps come with spring bars?
Yes — every Delugs strap comes with quick-release spring bars pre-installed. This means you can change straps by hand in seconds, without needing any tools. The quick-release mechanism uses a small lever that you pull with your fingertip to compress the spring bar.
What is the best strap material for the Tudor Black Bay 31 S&G?
For a dress watch like the Black Bay 31 S&G, alligator and chèvre leather are the most natural fits — they complement the refined aesthetics without overpowering the watch. For everyday versatility, saffiano and nubuck offer a balance of formality and durability. Our Strap Finder can help narrow down the best option for your style.
Does Tudor use quick-release spring bars?
Most Tudor watches use standard spring bars that require a tool to remove. All Delugs straps come with quick-release spring bars pre-installed, so once you make the switch, future changes are completely tool-free.
Where can I find straps compatible with the Tudor M79603-0008?
The Tudor Strap Finder shows every Delugs strap compatible with the M79603-0008, filtered by lug width and style. You can also use the general Strap Finder to browse by brand, collection, and material. If you need help choosing, our team is available 24/7 via live chat.
Finding Your Strap
The beauty of the Tudor Black Bay 31 S&G is that it rewards experimentation. A dressy alligator for the office, nubuck for the weekend — each strap brings out a different side of the watch.
Use the Tudor Black Bay 31 S&G Strap Finder to see every compatible strap in one place, filtered to your exact reference. Or if you'd rather explore by feel, the general Tudor Strap Finder lets you browse the full lineup and find your match.
Not sure which strap is right for your specific Black Bay 31 S&G? Our team is available 24/7 via live chat — drop us a message and we'll help you find the perfect match for your watch, wrist size, and style.
Quick Specs
| Case diameter | 31mm |
| Lug width | 17mm |
| Case thickness | 11.3mm |
| Water resistance | 150m |
| Crystal | Sapphire |
| Case material | Stainless steel with 18k yellow gold bezel, crown and centre bracelet links |
| Movement | Calibre T201 (self-winding) |
About Delugs
Founded in 2018 and headquartered in Singapore, Delugs is dedicated to elevating the experience of watch ownership through the simple yet powerful act of strap changing. We believe that straps are integral to how a timepiece is worn, perceived, and enjoyed. Our mission is to make strap changing a lifestyle — an everyday act of self-expression and versatility.
Delugs is an independent brand with a global community of clients, with a strong online presence and growing physical retail footprint. Our direct-to-consumer focus keeps us closely connected with the watch enthusiast community — fostering conversations, hosting events, and helping shape a more inclusive and expressive culture around watch collecting. We also work closely with watch brands to craft straps that complement their timepieces, bridging the gap between brand and collector, form and function.
Our catalogue spans leather, rubber, and fabric straps, with options for every watch and every occasion. We are committed to craftsmanship and quality, product design and innovation, and outstanding customer service. We offer watch owners the freedom to change straps as easily as changing outfits, and the opportunity to engage more deeply with the watches they love.
Visit our flagship boutique at Raffles Hotel, Singapore →
— Marcus
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