La Joux-Perret · Switzerland · Standard, Soigné
La Joux-Perret G101
La Joux-Perret introduced the G100 movement family around 2021–2022, with the G101 as its true no-date variant. La Joux-Perret, owned by the Citizen Group since 2012, has openly acknowledged that the G100 platform's development started from the Miyota 9-Series architecture, yet its plates, bridges, and other component parts are produced in-house in Switzerland.
The G101 maintains dimensional compatibility with the ETA 2824 footprint, making it straightforward to fit into existing case designs. Relative to the Miyota 9015 it derives inspiration from, the G101 delivers a substantially longer 68-hour power reserve (vs. ~42 hours), KIF anti-shock in place of Miyota's Parashock, and an Etachron-style fine-adjustment regulator.
Two named finishing grades are offered: Standard (tested in 3 positions, ±12 s/day average) and Soigné (adjusted to 4 positions, ±7 s/day average), with decorative options including Côtes de Genève, blued screws, and polished chamfers. The movement has found a receptive audience among independent British and European brands — notably Farer, anOrdain, Reservoir, and Frédérique Constant — that want Swiss-manufacture credentials and a meaningful power-reserve advantage without dependence on ETA supply.
Hz
Jewels
Reserve
In catalog
Technical specification
| Manufacturer | La Joux-Perret |
| Origin | Switzerland |
| Type | Automatic |
| Beat rate | 28,800 bph · 4 Hz |
| Jewels | 24 |
| Power reserve | 68 h |
| Diameter | 25.6 mm |
| Height | 4.45 mm |
| Hacking seconds | Yes |
| Hand-winding | Yes |
| Date | No |
| GMT | No |
| Chronograph | No |
| Accuracy (stated) | ±12 s/day avg, ±30 s/day max (Standard); ±7 s/day avg, ±20 s/day max (Soigné) |
| Based on | La Joux-Perret G100 |
3 models
Watches with this caliber
FAQ
Is the La Joux-Perret G101 automatic or manual?
The La Joux-Perret G101 is an automatic (self-winding) movement: a rotor winds the mainspring from the motion of your wrist, so it needs no battery. It can also be wound by hand via the crown.
What is the power reserve of the La Joux-Perret G101?
About 68 hours on a full wind — comfortably over two days, so it survives a weekend off the wrist. Power reserve is how long the La Joux-Perret G101 keeps running once you stop wearing or winding it.
Does the La Joux-Perret G101 hack (stop the seconds when you set it)?
Yes. Pulling the crown stops the seconds hand, so the La Joux-Perret G101 can be set precisely to a reference time before you push the crown back in. Hacking is what lets you sync several watches — or a watch and a phone — to the exact second.
Does the La Joux-Perret G101 have a date function?
No — the La Joux-Perret G101 has no date complication, so every watch built on it runs a clean, date-free dial. That suits symmetrical and vintage-style designs, and means one less thing to reset whenever the movement is allowed to stop.
How accurate is the La Joux-Perret G101?
The La Joux-Perret G101 is rated at ±12 s/day avg, ±30 s/day max (Standard); ±7 s/day avg, ±20 s/day max (Soigné). That is a normal working range for an uncertified mechanical movement; a COSC-certified chronometer is held to a tighter −4/+6 s/day, and a watchmaker can usually regulate one closer. Real-world accuracy still depends on how each watch is regulated, worn, and serviced.
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