Grand Seiko SBGA443 Four Seasons · Ref. SBGA443 · 20mm lug · 40mm case
At a Glance
| # | Best For | Strap | Material | Thickness |
|---|---|---|---|---|
| 1 | Overall / First Purchase | Bordeaux Chevre Slim Strap | Chèvre | 2.2mm |
| 2 | Dressy / Formal | Glossy Emerald Crocodile Signature Strap | Crocodile | 4.5–2.2mm |
| 3 | Everyday / Casual | Brown Buttero Slim Strap | Buttero Calfskin | 2.2mm |
| 4 | Minimalist / Refined | Green Shell Cordovan Slim Strap | Shell Cordovan | 2.2mm |
| 5 | Casual / Relaxed | Cream Baranil Signature Strap | Baranil Calfskin | 4.5–2.2mm |
| 6 | Active / Sporty | Red Waffle CTS Rubber Strap | FKM Rubber | 4.0–3.3mm |
| 7 | Comfort / Wildcard | Anthracite Hook Strap [kollokium x Delugs] | Fabric | 1.3mm |
Grand Seiko has always been about quiet mastery — the kind of watchmaking that reveals itself the closer you look. The SBGA443 Four Seasons (ref. SBGA443) is a perfect example. The finishing and attention to detail speak for themselves. With a 20mm lug width, it takes aftermarket straps beautifully.
At 40mm across and 12.8mm thick, the SBGA443 Four Seasons wears like a watch that was designed to be lived with — not just admired behind glass. A strap change can take it from boardroom to weekend without missing a beat.
Here are my 7 picks — and why each one works.
Quick Specs
| Case diameter | 40mm |
| Lug width | 20mm |
| Lug-to-lug | 47mm |
| Case thickness | 12.8mm |
| Water resistance | 100m |
| Crystal | Sapphire with AR coating |
| Case material | High-intensity titanium |
| Movement | Caliber 9R65 (Spring Drive, 72h power reserve, +/-15s/month) |
The 20mm lug width means your options are curated but well-covered. Already know what you're looking for? Browse all Grand Seiko SBGA443 Four Seasons-compatible straps on the Strap Finder →
1. Best Overall — Bordeaux Chevre Slim Strap
Every watch needs a go-to strap, and for the Grand Seiko SBGA443 Four Seasons, this is it.
The Bordeaux Chevre Slim Strap is made from chevre (goatskin) leather, sourced from the Alran tannery. The natural pebbled grain is finer than Epsom and slightly shiny — it looks luxurious without trying too hard. Chevre is also impressively water and scratch resistant for a natural leather. At 2.2mm thick, it balances presence and wearability nicely.
Paired with the Grand Seiko SBGA443 Four Seasons's distinctive dial, this strap adds a layer of personality that the factory option does not offer. The 12.8mm case thickness means a padded strap like this one feels proportional and substantial.
A combination that's greater than the sum of its parts.
Worth a look in other colourways:
- Light Grey Chevre Slim Strap
- Colibri Chevre Slim Strap
- Lavender Chevre Slim Strap
- Gold Chevre Slim Strap
2. Best Dressy — Glossy Emerald Crocodile Signature Strap
Formal occasions call for something elevated. This delivers without being flashy.
The Glossy Emerald Crocodile Signature Strap is made from genuine crocodile leather with a distinctive scale pattern that no embossed leather can replicate. The texture adds visual depth and character that works equally well with a suit or a smart-casual outfit. At 4.5–2.2mm thick, it balances presence and wearability nicely.
Paired with the Grand Seiko SBGA443 Four Seasons's distinctive dial, this strap adds a layer of personality that the factory option does not offer. The 12.8mm case thickness means a padded strap like this one feels proportional and substantial.
Simple, effective, and genuinely enjoyable to wear.
Alternatives in the same family:
- Glossy Caramel Crocodile Signature Strap
- Glossy Lagoon Blue Crocodile Signature Strap
- Glossy Taupe Brown Crocodile Signature Strap
- Glossy Grey Crocodile Signature Strap
3. Best Everyday — Brown Buttero Slim Strap
Your daily strap should feel invisible on the wrist. This one gets close.
The Brown Buttero 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.
The Grand Seiko SBGA443 Four Seasons's 40mm case is ideally proportioned for this strap. Whether you are wearing it casually or dressing it up, the combination feels intentional. It is the kind of pairing where both the watch and strap look better together than apart.
It's the kind of pairing that makes you wonder why you didn't try it sooner.
Other colours worth considering:
- Chestnut Buttero Slim Strap
- Taupe Buttero Slim Strap
- Natural Buttero Slim Strap
- Green Buttero Slim Strap
4. Best Minimalist — Green Shell Cordovan Slim Strap
Strip away the unnecessary and what's left is pure design. That's this strap.
The Green 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 Grand Seiko SBGA443 Four Seasons's 40mm case is ideally proportioned for this strap. Whether you are wearing it casually or dressing it up, the combination feels intentional. It is the kind of pairing where both the watch and strap look better together than apart.
It's the kind of pairing that makes you wonder why you didn't try it sooner.
Other colours worth considering:
- Black Shell Cordovan Slim Strap
- Navy Shell Cordovan Slim Strap
- Cognac Shell Cordovan Slim Strap
- Natural Shell Cordovan Slim Strap
5. Best Casual — Cream Baranil Signature Strap
Not every strap needs to make a statement. Sometimes relaxed is the right move.
The Cream Baranil Signature Strap is crafted from premium materials with careful attention to detail and construction quality. At 4.5–2.2mm thick, it balances presence and wearability nicely.
What makes this pairing work on the Grand Seiko SBGA443 Four Seasons is the contrast — the refined case finishing against the texture creates visual interest without conflict. With a 40mm case, the proportions stay balanced.
It's the kind of pairing that makes you wonder why you didn't try it sooner.
Other colours worth considering:
- Fauve Baranil Signature Strap
- Black Baranil Signature Strap
- Cobalt Baranil Signature Strap
- Gold Baranil Signature Strap
6. Best Sporty — Red Waffle CTS Rubber Strap
Active wear demands a strap that can handle sweat and splashes. This one does.
The Red Waffle CTS Rubber Strap is made from FKM rubber — a high-performance elastomer that resists chemicals, heat, and ageing. Unlike silicone, it does not attract dust or lint. Cut-to-size construction means you trim it to your exact wrist measurement — no leftover tail, no keepers. At 4.0–3.3mm thick, it balances presence and wearability nicely.
Paired with the Grand Seiko SBGA443 Four Seasons's distinctive dial, this strap adds a layer of personality that the factory option does not offer. The 12.8mm case thickness means a padded strap like this one feels proportional and substantial.
Once you see it on the wrist, it just clicks.
The range goes deeper if you want to explore:
7. The Wildcard — Anthracite Hook Strap [kollokium x Delugs]
![Anthracite Hook Strap [kollokium x Delugs] on Grand Seiko SBGA443 Four Seasons](https://cdn.shopify.com/s/files/1/0054/9040/9585/files/20250919-A7405309.jpg?v=1761299094&width=800)
Every rotation needs a curveball. This is mine.
The Anthracite Hook Strap [kollokium x Delugs] is crafted from premium materials with careful attention to detail and construction quality. At 1.3mm thick, it balances presence and wearability nicely.
![Anthracite Hook Strap [kollokium x Delugs]](https://cdn.shopify.com/s/files/1/0054/9040/9585/files/Kollokium_straps_Anthracite_1.jpg?v=1761299094)
What makes this pairing work on the Grand Seiko SBGA443 Four Seasons is the contrast — the refined case finishing against the texture creates visual interest without conflict. With a 40mm case, the proportions stay balanced.
It's the kind of pairing that makes you wonder why you didn't try it sooner.
Other colours worth considering:
- Warm Grey Hook Strap [kollokium x Delugs]
- Black Hook Strap [kollokium x Delugs]
- Khaki-Green Hook Strap [kollokium x Delugs]
- Orange Hook Strap [kollokium x Delugs]
A Note on Buckle Colour
Quick but important: always match your buckle to your case. The Grand Seiko SBGA443 Four Seasons's High-intensity titanium case calls for a silver (brushed) buckle — the matte finish of titanium pairs better with brushed hardware. 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 Grand Seiko SBGA443 Four Seasons
Swapping straps on the Grand Seiko SBGA443 Four Seasons is one of the easiest upgrades you can make — and with Delugs straps, you don't even need a tool.
If your Grand Seiko SBGA443 Four Seasons came on a bracelet, you'll first need to remove it. The easiest way to do this at home is with a Bracelet Removal Tool, which lets you compress the spring bars without risking scratches to the lugs or caseback. Once the bracelet is off, you can slide your new Delugs strap straight in.
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 Grand Seiko SBGA443 Four Seasons uses a standard 20mm lug width, and all Delugs straps in 20mm will fit perfectly.
Frequently Asked Questions
What is the lug width of the Grand Seiko SBGA443?
The Grand Seiko SBGA443 has a 20mm lug width. While 20mm is less common than 20mm, there is still a strong selection of quality straps available. All Delugs straps are available in 20mm.
What is the reference number for the Grand Seiko SBGA443 Four Seasons?
The reference number for the Grand Seiko SBGA443 Four Seasons is SBGA443. 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 a dressy leather strap on a Grand Seiko versatile watch?
The SBGA443 Four Seasons is one of the most versatile watches in the Grand Seiko lineup — it takes both dressy and casual straps equally well. That's part of what makes it such a rewarding watch for strap changes. Don't be afraid to experiment.
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 Grand Seiko SBGA443 Four Seasons?
The SBGA443 Four Seasons's versatile nature means it works with almost everything. Start with what matches your most common wearing occasion — rubber or sailcloth for active use, nubuck or waxy leather for everyday, and alligator or saffiano for dressier moments. The Strap Finder makes it easy to browse by material and style.
Does Grand Seiko use quick-release spring bars?
Most Grand Seiko models do not come with quick-release spring bars from the factory — they use standard spring bars that require a spring bar tool to remove. However, all Delugs straps come with quick-release spring bars pre-installed, so once you switch to a Delugs strap, all future strap changes will be tool-free.
Where can I find straps compatible with the Grand Seiko SBGA443?
The Grand Seiko Strap Finder shows every Delugs strap compatible with the SBGA443, 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 Grand Seiko SBGA443 Four Seasons 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 Grand Seiko SBGA443 Four Seasons 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 Grand Seiko Strap Finder lets you browse the full lineup and find your match.
Not sure which strap is right for your specific SBGA443 Four Seasons? 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.
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
![Anthracite Hook Strap [kollokium x Delugs] - Image 2](http://delugs.com/cdn/shop/files/20250919-A7405309_298x298_crop_center.jpg?v=1761299094)
![Delugs Anthracite Hook Strap [kollokium x Delugs] Fabric Watch Strap](http://delugs.com/cdn/shop/files/Kollokium_straps_Anthracite_1_298x298_crop_center.jpg?v=1761299094)
