The Louis Moinet Impulsion Onyx is a red-gold monopusher chronograph built around a one-minute flying tourbillon. The title model is reference LM-114.40.50: Louis Moinet lists it in 18K red gold with Grade 5 titanium and limits the edition to 28 watches. It is distinct from the titanium Impulsion Onyx, reference LM-114.20.50, a separate 12-piece edition.
How the Impulsion Onyx displays its complications
The watch puts its chronograph and tourbillon together on the dial side. The Foundation of Haute Horlogerie describes the interaction this way: “A single pusher activates the chronograph hand, which counts the seconds as it sails over the one-minute flying tourbillon at 6 o’clock.” The result is a seconds display that visibly traverses the tourbillon rather than keeping the two mechanisms apart.
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It is a monopusher chronograph, so one pusher controls the chronograph functions. The movement is manual-winding, not automatic. The Foundation describes a double-barrel LM114 movement, with a 96-hour power reserve; Fratello also reports 36 jewels and a frequency of 28,800 vibrations per hour.
Reported specifications for the red-gold LM-114.40.50
Louis Moinet’s collection listing establishes the red-gold and Grade 5 titanium materials and the 28-watch edition, but it is not a complete technical sheet. The following dimensions and construction details are reported by Fratello; the Foundation of Haute Horlogerie independently lists the diameter, water resistance, movement name and reserve.
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| Specification | Reported detail |
|---|---|
| Reference and edition | LM-114.40.50; limited to 28 watches, according to Louis Moinet’s collection listing. |
| Case | 18K red gold with Grade 5 titanium, according to Louis Moinet. Fratello describes a 5N red-gold outer case and Grade 5 titanium mid-case. |
| Diameter | 42.5 mm, reported by Fratello and listed by the Foundation of Haute Horlogerie. |
| Water resistance | 30 m, reported by Fratello and listed by the Foundation of Haute Horlogerie. |
| Movement | Hand-wound LM114 monopusher tourbillon chronograph; double-barrel arrangement, according to the Foundation of Haute Horlogerie. |
| Jewels and frequency | 36 jewels and 28,800 vph, reported by Fratello. |
| Power reserve | 96 hours, according to the Foundation of Haute Horlogerie and Fratello. |
| Chronograph display | Central chronograph seconds and a 30-minute counter, reported by Fratello. |
| Dial and crystal | Openworked dial with an onyx cage bridge, domed sapphire crystal and sapphire display back, reported by Fratello. |
| Strap | Black alligator strap, reported by Fratello. |
Do not confuse it with the titanium Onyx
Louis Moinet uses the Onyx name for two different Impulsion references. The collection listing identifies the red-gold LM-114.40.50 as an 18K red-gold and Grade 5 titanium watch limited to 28 pieces. The brand’s 2025 announcement describes the titanium LM-114.20.50 as a Grade 5 titanium model limited to 12 pieces.
| Model | Reference | Case description | Edition |
|---|---|---|---|
| Impulsion Onyx | LM-114.40.50 | 18K red gold with Grade 5 titanium | 28 watches; Louis Moinet collection listing, accessed 2026 |
| Impulsion Titanium Onyx | LM-114.20.50 | Grade 5 titanium | 12 watches; Louis Moinet announcement, 2025 |
The brand says the titanium reference weighs 39 grams and has a 59-component case structure. Those figures apply to LM-114.20.50, not the red-gold LM-114.40.50.
Price and availability
Fratello reports the red-gold reference’s price as available on request. No public price or current stock status for LM-114.40.50 is established here. A retailer price reported for the titanium LM-114.20.50 is not a price for this watch. Ask Louis Moinet or an authorized retailer to confirm the exact reference, current availability and price before making a purchase decision.
What to consider as an owner
The hand-wound movement means the watch must be wound by hand rather than replenishing its power automatically through wrist motion. Its reported 96-hour reserve describes the period it can run when fully wound, not a guarantee of uninterrupted timekeeping in every circumstance. The 30 m water-resistance figure is a reported specification, not evidence that this is a watch intended for swimming or diving.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
