If you own the 311.30.42.30.01.005, you own the version of the Moonwatch that a lot of collectors still argue is the real one. Hesalite crystal, hand-wound calibre 1861, solid caseback, and a case shape that has barely moved in half a century.
It is also one of the best strap watches Omega has ever made. And Omega clearly knew it, because of what they put in the box. More on that in a minute — first, the number you actually need.
The fit: 20mm, and there is no size to choose
The Speedmaster Professional is a 42mm case with a 20mm lug width. Not 19mm, not 21mm. Twenty, flat, across every reference in this family.
That is the entire sizing story here, which is a relief if you have ever tried to size a Seamaster. Every strap in our Speedmaster collection is cut to 20mm, so there is no width dropdown to get wrong on the product page. The only choice you make is buckle colour — and on a steel 311.30.42.30.01.005, silver is the match. Black is the other one people pick when they want the strap to disappear entirely.
One detail that is genuinely useful: this case has drilled lug holes. You can see them from the outside of the lugs. That means you can push the spring bar out with a pin from the side, instead of levering a forked tool in between the case and the strap — which is exactly where most scratched Speedmaster lugs come from. If you plan to swap straps often, and on this watch you will, that small thing is the difference between a clean case and a case with a story.
Spring bars come with every strap. If you would rather not improvise the rest, the Omega strap installation tool turns it into a thirty-second job.
A short history — and why this watch wants a strap
The 311.30.42.30.01.005 arrived in 2014 as the replacement for the long-running 3570.50.00, carrying over the same hand-wound calibre 1861 and the same domed Hesalite crystal NASA qualified for spaceflight. Same 42mm case, same black tachymeter bezel, same three-register black dial. It ran until the 3861 generation took over, which makes it the last of the 1861 Moonwatches — and a large part of why it still moves so well pre-owned.
Now the part that matters for this article. Omega sold this reference in the Moonwatch presentation box, and inside, next to the watch, they included a NATO strap, a strap for astronauts, a tool to change the bracelet, and a book.
Read that again: the manufacturer packed a strap-changing tool with the watch. This is not a watch you are modifying against anyone's intentions. It shipped expecting you to take the bracelet off.
Most owners eventually do. The bracelet is good, but it is the heaviest part of the watch and the surface that picks up hairlines fastest. A rubber strap fixes both at once, and it keeps the bracelet in the condition it was in the day you bought it.
What the dial gives you to work with
The Moonwatch is a two-colour watch. Matte black dial, black bezel, and everything on top of it in white and bright silver — the tachymeter scale, the minute track, the applied batons, the hands. Apart from the steel of the case, there is no third colour anywhere.
That is why the Speedmaster takes almost any strap without looking wrong, and it is also why the combinations that look considered rather than random tend to do one of two things: repeat the black and white, or borrow the brushed grey of the case. Anything else becomes a deliberate accent — which is fine, as long as you mean it.
Four that work.
1. Black with a white line — the dial, extended
Straight black and white, in roughly the proportion the dial already uses it: a wide black field with one clean white line running through. Sit it under the bezel and the stripe reads as a continuation of the tachymeter printing rather than a decoration on top of it.
This is the pick that looks the most designed on this reference, and it is the most popular of the LuxLine® options for the Speedmaster. If you are only buying one strap for this watch, make it the Black w/White Line LuxLine® and leave the bracelet in the drawer.
2. Black — the purist option
Our best-selling Speedmaster strap, and it is not hard to see why. All-black rubber takes every competing surface off the watch, so the only things catching light are the steel case and the white dial printing. The Moonwatch reads cleaner, wears noticeably lighter, and stops looking like a dress-watch-sized object on a bracelet.
This is the everyday one. Summer, travel, the gym, anywhere you would rather not be swinging steel around. Black rubber strap for Speedmaster →
3. Grey — match the case, not the dial
The option most people do not think of, and the one that photographs best. Grey picks up the brushed finish on the case flanks and the silver of the hands and markers instead of repeating the dial. Softer than black, and it lets the case shape show instead of merging the whole watch into one dark mass.
There is some history in it too. Grey fabric straps have been on Speedmasters since the days when the watch was issued kit. This is that look in FKM rubber, without the fraying. Grey rubber strap for Speedmaster →
4. Orange — the accent that actually belongs
Orange is not a random choice on a Speedmaster. Omega has used it on chronograph hands and racing dials across the family for decades, so on a plain black-and-white Moonwatch it reads as in-family rather than aftermarket. Against this dial it does one job, and does it well: your eye follows the chronograph seconds hand the whole way round.
A weekend strap, and a very good one. Orange rubber strap for Speedmaster →
If orange is a step further than you want to go, navy blue is the quieter version of the same idea — a colour, but one that behaves itself.
One note on the Hesalite
Worth saying, because it changes how you handle this particular reference. The crystal is Hesalite, not sapphire. It picks up marks from almost nothing, but it also polishes back out with a bit of paste and a cloth, which sapphire never does. The crystal is the forgiving part of this watch.
The lugs are not. They are polished on the flanks and they mark permanently. Which brings it back to the drilled holes and the tool: change straps carefully on this one and it stays sharp for decades.
Related Omega guides
- Omega Speedmaster Moonwatch 310.30.42.50.01.001 strap guide — the 3861 successor to this reference
- Omega Speedmaster '57 332.10.41.51.01.001 strap guide
- All Omega strap guides
Ready to change it?
Helvetus is one of the largest names in aftermarket luxury watch straps, and our Omega straps are built model by model rather than cut from a universal blank — so a Speedmaster strap fits a Speedmaster, with no gap at the case and no guesswork at checkout.
Every rubber strap carries a lifetime warranty. Shipping is free worldwide, there are no import costs wherever you order from, and more than 50,000 customers have already made the swap.
Browse all Speedmaster straps → See the full Omega strap range →
Helvetus is not affiliated with Omega SA. Model names are used for compatibility reference only.
