Ask people which Royal Pop they would actually wear every day and the Orenji Hachi comes up more than any of the bright ones. Navy Bioceramic, orange screws, orange details on the dial — it is the only reference in the collection built on a colour that behaves like a neutral, and it is the one that looks least like a toy in a photograph.
It is also the reference where the strap does something none of the others do. On the Orenji Hachi the strap does not change the colour scheme. It changes the ratio — and on a watch built from complementary opposites, the ratio is the whole design.
First, the only choice you have to make
The Royal Pop has no lugs, so there is no lug width to look up. Fit is decided by the layout of your reference.
Six of the eight are Lépine style — crown at 12 o'clock, hours and minutes only. Two are Savonnette, with the crown at 3 and a small seconds register at 6.
The Orenji Hachi (Ref. SSX03L103N) is a Lépine reference, so on the Royal Pop Orenji Hachi strap and case set you want the Crown at 12 version. The case turns the watch head so the crown finishes in the normal place on your wrist rather than pressing into the back of your hand. If you own one of the two side-winders, the Lan Ba set shows how the crown-at-3 layout is handled.
Beyond that the set is supplied matched to the reference, so the version is the only thing you pick. Here is why that is the right default on this particular watch.
Blue and orange is a ratio, not a pairing
Navy and orange sit directly opposite each other on the colour wheel. That is the highest-contrast relationship two colours can have, and it is exactly why a very small amount of orange registers so loudly on the Orenji Hachi. Eight screws and a few dial markings are doing as much visual work as a whole dial would in any other combination.
Which means the design only holds while the proportions hold. Keep the strap navy and the watch stays what it was drawn to be: a dark, wearable watch with a bright detail. Put orange on the strap and you roughly double the orange area on your wrist, and the watch stops being a navy watch with orange details and becomes an orange-and-navy watch. That is not wrong — complementary colours are the one case where a bold move is structurally sound — but it is a different object, and it should be a decision rather than a default.
The matched navy set is the default because it protects the ratio the watch was designed around. If you later want to invert it, that is a second set and a second look, not a correction.
This is also the only reference in the collection where a bold strap has a real argument behind it. On the red one, a third warm tone muddies the picture. On the green one, a third green reads as a mismatch. Here, orange against navy is not a near miss — it is the opposite side of the wheel, so it either matches or it deliberately contrasts, and both outcomes are legible. The Orenji Hachi is the reference that gives you room.
Three things that follow from that
It is the most wearable of the six Lépine references. Navy functions as a neutral in a way that red, pink, pale green and white simply do not. Worn on a matched navy strap, the Orenji Hachi is the Royal Pop you can put on without thinking about what else you have on — which is not true of most of the collection.
Legibility is the best in the range. Orange markings on a navy dial is close to the strongest separation available. It is the exact inverse of the Green Eight, where the bezel and dial sit in the same family and the watch reads as one solid shape. Worth knowing if you own both, because the Green Eight set is solving the opposite problem.
The buckle matters here. The set ships with a brushed stainless steel buckle, which is the right call. Navy takes polished hardware badly in bright light — it throws a highlight that competes with the orange rather than supporting it — and anything gold-toned starts a second warm conversation the watch did not ask for.
The mistake worth avoiding
If you were buying a strap for this yourself, the instinct is one of two things: a random navy from a general seller, or an orange one because the watch has orange on it.
The navy is the riskier of the two. Navy is not one colour, it is a family — there is a warm navy, a cold navy, a navy that goes purple in daylight and a navy that goes black indoors. A strap navy that is one step off the case navy does not read as contrast, it reads as a mismatched pair, and on a watch where the case and strap sit directly against each other that gap is visible from across a table.
The orange is the more forgiving mistake, because a contrasting orange is meant to contrast. But be aware of what it does to the proportion, and keep it to one element — an orange strap under an orange-screwed bezel is already the loudest version of this watch that exists.
The third thing to avoid on both routes is texture. The Petite Tapisserie stamping is the only fine detail on the dial; a woven or heavily grained strap next to it gives the eye two competing patterns.
What you are actually fitting
The Royal Pop was designed as a pocket watch. Swatch supplies a calfskin lanyard in three lengths and a desk stand, and no wrist option at all.
The Helvetus case is machined around the exact 40 mm octagonal Bioceramic head, 8.4 mm thick. The head pops out of its original chassis, clicks into the case, and the strap clips onto the case. Nothing is drilled, glued or altered; the sapphire caseback stays uncovered so the hand-wound SISTEM51 is still on show; and the whole thing reverses in seconds. The strap runs on quick-release hardware, so once the case is fitted the strap comes on and off without tools.
Each set is made for its own reference and layout, so they are not interchangeable — order the one that matches your watch. The full Royal Pop strap and case range covers all eight, with further options being added.
A short word on the watch
The Royal Pop landed in May 2026 and did to Audemars Piguet's design language what the MoonSwatch did to the Speedmaster: octagonal bezel, eight hexagonal screws, Petite Tapisserie dial, Royal Oak hands with luminous coating, all in Bioceramic. The eight references are named for the number eight in eight different languages, a nod to the bezel's eight sides — this one being the Japanese one.
Behind the sapphire caseback is a hand-wound version of the SISTEM51, a first for that calibre, with a 90-hour power reserve. It is rated to 20 metres, so keep it away from swimming pools. Rubber here is about wearing the watch without thinking, not about water.
Of the eight, the Orenji Hachi is the one that tends to end up in serious collections rather than on a shelf. Navy with a bright accent is a combination the wider watch world already understands, so it is the Royal Pop that needs the least explaining when someone asks what is on your wrist — and the one that gets the most out of being worn rather than displayed.
Common questions
Will a Royal Oak or MoonSwatch strap fit it? No. The Royal Pop has no lugs, so a conventional strap has nothing to attach to. It needs the case adapter, tooled to the Bioceramic head. If you also own a MoonSwatch, that range is separate and cut to 20 mm.
Can I use a set bought for another reference? No — order the one made for your watch. If you are not sure which you own, the crown position tells you: at 12 it is a Lépine, at 3 it is a Savonnette.
Should I go navy or orange? Navy first. It keeps the watch's proportions as designed and it is the version you will wear more. Orange is the second set, not the first one.
Does the case damage the watch? No. It clicks around the original case head on the same principle the factory lanyard uses, and comes off the same way. Nothing is modified.
I own a Royal Oak as well — is it the same part? Different part, same workshop. The Audemars Piguet strap range covers the Royal Oak 39 and 41, Offshore 42 and 44 and the Offshore Diver — the Offshore Diver range is where bright colour is most at home in the AP line-up — and the Royal Pop case grew directly out of that work.
Getting it onto the wrist
Helvetus has been engineering aftermarket straps for the Royal Oak family for years, which is why the Royal Pop case exists at all — the tolerances and the FKM compound come straight off that programme. Every rubber strap carries a lifetime warranty, shipping is free worldwide with no import costs at your end, returns run for 14 days, and more than 50,000 customers have bought from us.
If your Orenji Hachi has been on the lanyard since May, the strap and case set is what it was waiting for.
Helvetus is not affiliated with, endorsed by or sponsored by Audemars Piguet or Swatch AG. All trademarks are used for descriptive and compatibility purposes only. The watch is not included.
