Every other Bond Omega is a diver. This one isn't — and it's the only one Omega built to be worn two ways, because it left the factory with a bracelet and a strap in the box, plus a deployant clasp and the tool to swap them.
Reference 231.10.42.21.03.004 is the Seamaster Aqua Terra Omega made in 2015 for the release of SPECTRE. The dial is blue, patterned with the Bond family coat of arms interlocked into a repeating motif, with the same crest sitting near the tip of a yellow seconds hand. The rest of the story is on the back. If you own one, here's how to keep it wearable.
The size: 20mm
This reference takes a 20mm strap. A physical measurement of this exact watch gives 41.5mm across, 48mm lug-to-lug, 14mm thick and 20mm between the lugs — and the wider 41.5mm Aqua Terra case it shares has been measured at 20mm repeatedly across the family.
One warning worth having, because the Aqua Terra line is not consistent: the 38mm models take 19mm and the 43mm Worldtimer takes 21mm. If you own more than one Aqua Terra, they almost certainly don't share straps. For this one, select 20mm.
Our straps for the model are cut to work with your original Omega buckle. If you've only ever worn this watch on the bracelet, note that its clasp is a deployant rather than a pin buckle, so add one of ours at checkout — steel suits the polished case.
The joke is the edition number
Omega limited this watch to 15,007 pieces, which reads like a Bond gag and is actually a specification. The calibre 8507 inside resists magnetic fields beyond 15,000 gauss, and the caseback is engraved both with your piece's number out of 15'007 and with the proclamation "> 15'007" for the gauss rating. The edition size is the anti-magnetic figure. It was only the second Omega ever to use the 15,000-gauss version of this movement, after the yellow-accented Aqua Terra that introduced the technology in 2013.
Look through the sapphire caseback and there's the other detail people buy this watch for: the oscillating weight has been skeletonised and cut into the shape of a gun barrel. It rotates as you move.
That's the pattern with this reference. The front is remarkably restrained for a Bond watch — a crest motif you only read up close and one yellow hand — while the theatrics are all on the back. It's also the only dress-oriented watch in the entire Bond catalogue, which is what makes it the one you can actually wear to things.
Why this one needs a strap more than most
Three reasons, and the first is Omega's own doing.
This watch shipped with a blue coated-nylon fabric strap alongside the bracelet. Omega expected you to change it — the deployant and the strap tool were in the box. So swapping isn't a modification here; it's the configuration the manufacturer sold you.
Second, that included strap is now a decade old on every surviving example. Fabric fades, frays and holds moisture in a way rubber doesn't, and on a numbered limited edition the original is worth keeping in the box with the papers rather than wearing out. A rubber strap lets you use the watch daily and keep the set complete.
Third, and this is the part that actually changes how the watch looks: the dial is a pattern, not just a colour. The interlocking crest catches light at certain angles and disappears at others. A busy or high-contrast strap fights that; a calm one lets people notice it.
The best straps for the SPECTRE Aqua Terra
1. Full blue — the second strap, renewed
The strap Omega included was blue. A full blue rubber strap puts the watch back into exactly the two-look setup it was sold as — bracelet for dress, blue strap for everything else — except this version swims, sweats and wipes clean. Tone-on-tone with the dial, it also does the pattern the biggest favour of any option here: with nothing competing below the case, the crest motif becomes the thing your eye lands on. The default answer, and the one that respects the original design.
2. Black with an orange line — the yellow, answered
The only actual colour on this dial is that yellow seconds hand and the crest at its tip. We don't cut yellow for this case, and honestly it would be too much anyway — but a black strap with an orange line picks up the same warmth and gives the watch a single bright line running the length of the wrist to answer the single bright hand on the dial. Against a deep blue dial it looks deliberate rather than loud. The pick for owners who wear this as a sports watch rather than a dress one.
3. Full black — let the pattern show
The most understated option and, on a patterned dial, often the most flattering. A full black rubber strap puts a completely quiet base under the watch so the blue reads deeper and the interlocked crests get all the attention they deserve at close range. It's also the most versatile strap in the drawer, and the one that makes a limited edition look like a watch you actually wear rather than a collectible you're minding.
4. Blue with a white line — the dress side
This is the only Bond Omega you can wear with tailoring, so it deserves one option built for that. A blue strap with a white line is the crispest configuration on this list — the white line reads like a shirt cuff edge, the blue keeps it tonal, and the whole thing sits under a jacket sleeve without looking like a diver in disguise. The strap for the occasions this watch was designed for.
The short version
20mm — not the 19mm of the 38mm Aqua Terras or the 21mm of the Worldtimer. Blue to restore Omega's own two-strap setup, black with orange for the yellow hand, full black to show the pattern, blue and white for tailoring.
Every strap in our Aqua Terra collection is precision-cut for this case, ships with spring bars included, and carries a lifetime warranty on rubber — with free worldwide shipping and no import costs, part of why more than 50,000 customers have trusted us with their watches. Guides to every other Omega we've covered live in the Omega strap guide hub. Omega sold this one with a spare strap in the box. Eleven years on, it's time for the next one.
