Best Omega Speedmaster Professional Moonwatch 3861 Straps

Omega Speedmaster Professional Moonwatch 3861 on wrist

At a Glance

#	Best For	Strap	Material	Thickness
1	Overall / First Purchase	Woodland Forest Strap	Leather	N/A
2	Dressy / Formal	Cream Baranil Signature Strap	Baranil	N/A
3	Everyday / Casual	Cognac Crazy Horse Side-Stitch Strap	Calfskin (Waxy)	N/A
4	Minimalist / Refined	Maroon Crazy Horse Side-Stitch Strap	Calfskin (Waxy)	N/A
5	Casual / Relaxed	Nubuck Black Ostrich Leg Signature Strap	Calfskin (Nubuck)	N/A
6	Active / Sporty	Red Chevre Slim Strap	Goatskin (Chèvre)	N/A
7	Comfort / Wildcard	Matte Grey Storm Alligator Signature Strap	Alligator	N/A

Omega has a way of surprising you with how much watch you get. The Speedmaster Professional Moonwatch 3861 (ref. 310.30.42.50.01.002) is a case in point. Its black dial with asymmetric case, tachymeter bezel, chronograph subdials at 3, 6, 9 o'clock. A 20mm lug width and that unmistakable character make this watch a natural platform for strap changes.

The 42mm case with its 13.2mm 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.

Quick Specs

Case diameter	42mm
Lug width	20mm
Lug-to-lug	47.5mm
Case thickness	13.2mm
Water resistance	50m
Crystal	Sapphire with sapphire caseback
Case material	Stainless steel
Movement	Manual-winding, Co-Axial Master Chronometer, Calibre 3861, 50h power reserve

The 20mm lug width means your options are curated but well-covered. Already know what you're looking for? Browse all Omega Speedmaster Professional Moonwatch 3861-compatible straps on the Strap Finder →

1. Best Overall — Woodland Forest Strap

Woodland Forest Strap on Omega Speedmaster Professional Moonwatch 3861

Your first strap upgrade should feel like an obvious improvement. This one does.

The Woodland Forest Strap is crafted from premium materials with careful attention to detail and construction quality.

The Omega Speedmaster Professional Moonwatch 3861's 42mm 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.

2. Best Dressy — Cream Baranil Signature Strap

Cream Baranil Signature Strap on Omega Speedmaster Professional Moonwatch 3861

Formal occasions call for something elevated. This delivers without being flashy.

The Cream Baranil Signature Strap is crafted from premium materials with careful attention to detail and construction quality.

Paired with the Omega Speedmaster Professional Moonwatch 3861's black dial, this strap adds a layer of personality that the factory option does not offer. The 13.2mm case thickness means a padded strap like this one feels proportional and substantial.

If this style appeals but you want a different tone:

3. Best Everyday — Cognac Crazy Horse Side-Stitch Strap

Cognac Crazy Horse Side-Stitch Strap on Omega Speedmaster Professional Moonwatch 3861

An everyday strap needs to be comfortable from the jump and work with most of what you wear.

The Cognac Crazy Horse Side-Stitch Strap uses crazy horse leather — an oil-infused leather that develops character with every scratch and mark. Rub a scratch with your thumb and it blends right back in. It is built for people who actually wear their watches, not baby them.

On the Omega Speedmaster Professional Moonwatch 3861, this strap balances the tool-watch DNA with a touch of refinement. The 42mm case at 13.2mm thick pairs naturally with the padded construction without creating any imbalance on the wrist.

Simple, effective, and genuinely enjoyable to wear.

Alternatives in the same family:

4. Best Minimalist — Maroon Crazy Horse Side-Stitch Strap

Maroon Crazy Horse Side-Stitch Strap on Omega Speedmaster Professional Moonwatch 3861

Sometimes less is more. This strap proves it.

The Maroon Crazy Horse Side-Stitch Strap uses crazy horse leather — an oil-infused leather that develops character with every scratch and mark. Rub a scratch with your thumb and it blends right back in. It is built for people who actually wear their watches, not baby them.

Simple, effective, and genuinely enjoyable to wear.

Alternatives in the same family:

5. Best Casual — Nubuck Black Ostrich Leg Signature Strap

Nubuck Black Ostrich Leg Signature Strap on Omega Speedmaster Professional Moonwatch 3861

Not every strap needs to make a statement. Sometimes relaxed is the right move.

The Nubuck Black Ostrich Leg Signature Strap is crafted from nubuck leather — soft, velvety to the touch, and comfortable from the first wear. No break-in period needed. The suede-like texture adds a casual warmth that takes the edge off a formal watch without losing sophistication.

What makes this pairing work on the Omega Speedmaster Professional Moonwatch 3861 is the contrast — the sporty character of the watch is complemented by the practical construction. With a 42mm case, the proportions stay balanced.

Simple, effective, and genuinely enjoyable to wear.

6. Best Sporty — Red Chevre Slim Strap

Red Chevre Slim Strap on Omega Speedmaster Professional Moonwatch 3861

Not every sporty strap needs to be water-resistant — sometimes it is about the texture and attitude.

The Red 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.

The range goes deeper if you want to explore:

7. The Wildcard — Matte Grey Storm Alligator Signature Strap

Matte Grey Storm Alligator Signature Strap on Omega Speedmaster Professional Moonwatch 3861

Not the obvious choice, but sometimes the unexpected pairing is the best one.

The Matte Grey Storm 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.

It's the kind of pairing that makes you wonder why you didn't try it sooner.

Other colours worth considering:

A Note on Buckle Colour

Quick but important: always match your buckle to your case. The Omega Speedmaster Professional Moonwatch 3861's Stainless steel case calls for a silver (brushed or polished) buckle. 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 Omega Speedmaster Professional Moonwatch 3861

Swapping straps on the Omega Speedmaster Professional Moonwatch 3861 is one of the easiest upgrades you can make — and with Delugs straps, you don't even need a tool.

If your Omega Speedmaster Professional Moonwatch 3861 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 Omega Speedmaster Professional Moonwatch 3861 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 Omega 310.30.42.50.01.002?

The Omega 310.30.42.50.01.002 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 Omega Speedmaster Professional Moonwatch 3861?

The reference number for the Omega Speedmaster Professional Moonwatch 3861 is 310.30.42.50.01.002. 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 Omega sport watch?

Yes — and it's a surprisingly good combination. Putting the Speedmaster Professional Moonwatch 3861 on a leather strap, especially something like an alligator or saffiano, dresses it up for occasions where a bracelet or rubber might feel too casual. The contrast between a sport watch and a refined strap can be striking.

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 Omega Speedmaster Professional Moonwatch 3861?

For the Speedmaster Professional Moonwatch 3861, rubber and sailcloth are excellent starting points — waterproof, durable, and purpose-built for active wear. If you want to dress it up, waxy or nubuck leather straps add character while remaining practical. Browse the Strap Finder to see all compatible options.

Does Omega use quick-release spring bars?

Most Omega 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 Omega 310.30.42.50.01.002?

The Omega Strap Finder shows every Delugs strap compatible with the 310.30.42.50.01.002, 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 Omega Speedmaster Professional Moonwatch 3861 is that it rewards experimentation. Leather one day, rubber the next — each strap brings out a different side of the watch.

Use the Omega Speedmaster Professional Moonwatch 3861 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 Omega Strap Finder lets you browse the full lineup and find your match.

Not sure which strap is right for your specific Speedmaster Professional Moonwatch 3861? 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