Sellita SW200 vs La Joux-Perret G100: The Workhorse vs The Newcomer
The Sellita SW200 is the movement you already know. The Swiss automatic that replaced the ETA 2824-2 for most independent brands, running in everything from Christopher Ward to Sinn to Halios. Proven and serviceable.
The La Joux-Perret G100 is the one you probably don't know yet. A Swiss-made movement with a 68-hour power reserve, 4Hz beat rate, and an origin story that complicates the usual Swiss vs Japanese narrative — because the G100 is built on the Miyota 9015 architecture, re-engineered and upgraded by a Swiss manufacturer owned by the same Japanese parent company that makes the Miyota.
That sentence deserves unpacking, so let's do that.
The Specs
| Sellita SW200-1 | La Joux-Perret G100 | |
|---|---|---|
| Manufacturer | Sellita (Switzerland) | La Joux-Perret (Switzerland) |
| Parent company | Independent (Sellita) | Citizen Group (Japan) |
| Jewels | 26 | 24 |
| Beat rate | 28,800 vph (4Hz) | 28,800 vph (4Hz) |
| Power reserve | 38-41 hours | 68 hours |
| Thickness | 4.60mm | 4.45mm |
| Diameter | 25.6mm | 25.6mm |
| Date | Yes — no-date available | Yes (G100) / No (G101) |
| Hacking & hand-wind | Yes | Yes |
| Rotor | Bidirectional (ball bearing) | Unidirectional (tungsten, ball bearing) |
| Accuracy | Depends on grade | Depends on grade |
| Shock protection | Novodiac / Incabloc (by grade) | KIF |
| Architecture | Clone of ETA 2824-2 | Based on Miyota 9015 |
Same beat rate. Same diameter — deliberately, because the G100 was designed to be dimensionally compatible with ETA 2824 cases, meaning any brand already casing the SW200 can swap to the G100 without retooling. But the power reserve line and the architecture line are where this gets interesting.
The Origin Story That Changes Everything
La Joux-Perret is headquartered in La Chaux-de-Fonds, Switzerland — the heart of Swiss watchmaking. They've produced movements and complications for brands including Hublot and Girard-Perregaux, and they manufacture calibres for Arnold & Son (a fellow Citizen Group brand). Serious credentials.
In 2012, Citizen Group — the Japanese corporation that owns Miyota — acquired La Joux-Perret. That made Citizen the owner of both the Miyota 9015 (Japan's premium automatic) and La Joux-Perret's Swiss development capability. The G100 is the result: take the proven 9015 architecture, re-engineer it in Switzerland, upgrade the components, and produce a movement that carries the Swiss Made label with a 68-hour power reserve.
La Joux-Perret is transparent about this. The development started with the Miyota 9-series platform. The gear train, barrel, and balance have all been re-engineered. The bridges have been reworked with curved edges. The rotor is single-piece tungsten with a palladium coating instead of Miyota's two-piece construction. The shock protection switched from Parashock to KIF. The barrel and mainspring were redesigned to deliver 68 hours instead of 42.
The result is a movement that's visually and architecturally related to the 9015 but functionally a different calibre. Caliber Corner's community has described it as "a Swiss 9015" — and while that's reductive, it's not entirely wrong. It's a Swiss 9015 the way an SW200 is a Swiss ETA 2824: same DNA, different execution.
Power Reserve: 68 Hours vs 38-41 Hours
This is the headline difference and it's not close.
Sixty-eight hours. Nearly three full days off the wrist. You can take this watch off Friday evening and it'll still be running Monday morning with room to spare. The SW200's 38-41 hours barely gets you through the weekend if you take it off Friday night.
For anyone who rotates watches — and most people buying in the £500-1,000 range own more than one — this is a genuine daily-use advantage. Setting the time and date every time you pick up a watch gets old. The G100 lets you leave a watch sitting for close to three days and come back to it still running. That's the kind of practical benefit that matters more than paper specs usually do.
This is also why Farer moved to the G100/G101 for their three-hand range. Their product page is explicit about it: the opportunity to offer nearly three days of power reserve for under £1,000 was too good to pass up. Other brands — Anordain, Zelos, Furlan Marri, DWISS — have made the same call for the same reason.
Thickness: 4.45mm vs 4.60mm
The G100 is 0.15mm thinner than the SW200. This is not the kind of gap that changes case design — unlike the full millimetre between the SW200 and SW300, or the 1.42mm between the 9015 and the NH35. Both movements produce watches in the same 11-13mm case thickness range.
The G100 was designed to be dimensionally compatible with ETA 2824 cases. That means a brand already tooled for the SW200 can drop in a G100 without redesigning the case. It's a smart strategic move by La Joux-Perret — it removes the biggest barrier to adoption by making the switch frictionless for manufacturers.
The Rotor
The G100 uses a unidirectional rotor. The SW200 uses a bidirectional one.
Bidirectional is generally considered the better engineering — winds in both directions, quieter, more efficient. Unidirectional is what the Miyota 9015 uses, and the G100 inherited it. La Joux-Perret upgraded the rotor itself — single-piece tungsten with palladium coating versus Miyota's two-piece construction — but kept the unidirectional winding.
Does this matter? In daily wear, both stay wound. The SW200's bidirectional system is theoretically more efficient and tends to be quieter. The G100's 68-hour power reserve compensates for any efficiency gap — even if it winds slightly less efficiently per rotation, it has so much reserve that it doesn't matter in practice.
The noise question is harder to answer because the G100 hasn't been on the market long enough for a community consensus. Given its Miyota DNA, it's worth being aware that unidirectional rotors can sometimes be audible — though the heavier tungsten rotor may help dampen it. If rotor noise has bothered you on a Miyota 9015 before, ask the brand or try the watch on before committing. If it's never been an issue for you, don't worry about it here either.
Serviceability: The Honest Gap
This is where the SW200 has a real, undeniable advantage.
The SW200 is based on the ETA 2824-2 architecture. Every watchmaker in the world knows how to service it. Parts are everywhere. Service procedures are standardised. If something goes wrong in ten years, you'll have no trouble getting it fixed anywhere.
The G100 is new. It launched within the last few years and hasn't been on the market long enough for widespread spare parts availability or community service experience. La Joux-Perret has confirmed they're happy to supply spare parts to independent watchmakers — Anordain specifically tested this — but the parts network isn't yet as deep as Sellita's.
This will change over time as more G100s enter the market and more watchmakers gain experience with them. But right now, in 2026, the SW200 is the safer bet for long-term serviceability. If you're buying a watch to keep for twenty years and you want to know it'll be easy to service anywhere in the world, the SW200 has a meaningful head start.
Grades
The SW200 has its established four-tier system: Standard, Special, Premium, and Chronometer. The grade differences are well-documented and we've covered them extensively in the 9015 vs SW200 comparison.
The G100's grading is less standardised in public documentation. Farer uses what they call "Soigné" grade — LJP's highest standard, adjusted in four positions. Zelos has also used the Soigné grade. Standard grade appears to have accuracy within ±20 seconds per day, with Soigné tightening that to ±15.
The key difference: the SW200 at Premium grade (five-position adjustment, Glucydur, Incabloc) is a genuinely superior regulated movement. The G100 at Soigné (four-position adjustment, KIF) is very good but not quite at the same level of positional regulation. If maximum accuracy matters to you more than power reserve, a Top Grade SW200 is still the stronger choice on regulation alone.
So Which One?
If you're buying a watch to keep for decades and long-term serviceability matters most — the SW200, especially in Premium or Top Grade. It's been the Swiss independent standard for twenty years, every watchmaker on earth knows it, and parts will be available for as long as you own the watch. You're paying for certainty.
If you're buying a watch to wear now and the practical benefit of three days' power reserve matters more to you than a deeper service network — the G100. Sixty-eight hours changes how you live with a watch. Setting the time and date every time you pick it up gets old, and the G100 solves that. The brands using it (Farer, Anordain, Zelos, Furlan Marri) are serious operations that wouldn't have switched if the movement didn't deliver.
Personally, I think the G100 is the more interesting movement — it offers something the SW200 doesn't rather than just matching it on different terms. But "interesting" isn't the same as "proven," and the SW200's track record is worth respecting. Ask me again in five years when the G100 has a service history to evaluate, and the answer might be more definitive.
If you want help figuring out what's inside a specific watch you're looking at, that's what we're here for at CalderoneWatchCo.