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Louis Erard 2340 Louis Erard X Astro Boy 40mm Limited Edition Mens Watch
Ref. 35123TA23.BMT12
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Stepping up in Louis Erard's range
A tonneau-shaped case pairs a satin-finished titanium middle with a polished stainless steel bezel, lugs, and crown — a hybrid construction that keeps the total weight to 92 grams. At 8.95mm thick and 40mm across, it sits close to the wrist. The screw-down caseback carries an engraved Astro Boy figure, while the domed sapphire crystal is treated with anti-reflective coating on both sides. The vertically brushed grey dial is built up in layers: an applied Astro Boy figure in flight, a smoke trail, clouds, and an engraved Metro City motif beneath. Applied silver baton indices and hands carry blue-emission Super-LumiNova. The Sellita SW300-1 automatic runs at 28,800vph with a 56-hour power reserve. The integrated bracelet combines satin titanium and polished steel links, fastened by a concealed butterfly clasp. Limited to 178 pieces.
- Reference
- 35123TA23.BMT12
- Brand
- Louis Erard
- Case size
- 40mm
- Case thickness
- 8.95mm
- Case material
- Stainless steel
- Dial
- Silver
- Crystal
- Sapphire
- Movement
- Automatic
- Calibre
- Sellita SW300-1
- Water resistance
- 50m
- Bracelet / strap
- Stainless steel bracelet
- Strap colour
- Silver
- Clasp
- Folding clasp
- Lume
- Super-LumiNova
- Retailer
- Goldsmiths
Additional specifications
- Lug-to-lug
- 41.5mm
- Power reserve
- 56 hours
- Weight
- 92g
Learn more about Louis Erard
Louis Erard was born in La Chaux-de-Fonds in 1893, into a town then producing a large share of the world's watches. He worked in its workshops, founded a watchmaking school in 1929, and set up a casing and assembly business with André Perret the same year. The first watches under his own name followed in 1931.
Assembly was the trade at the time: components came from independent artisans and the assembler built, adjusted and finished the watch. By 1937 Erard employed more than sixty people and was selling internationally.
The quartz crisis did its usual damage. The company was sold in 1991 and production moved to Le Noirmont in the Jura, then sold again in 2003 to a group led by Alain Spinedi, who refocused it on mechanical watches at prices that undercut everyone doing similar work.
The regulator became the signature — the dial layout that separates hours, minutes and seconds onto their own axes, borrowed from precision reference clocks, and rarely seen at this price.
What has made the brand's recent reputation is collaboration: limited editions with independent watchmakers whose own work is unobtainable, among them Vianney Halter, Konstantin Chaykin and Alain Silberstein, on Sellita and Valjoux movements.
- 1929
- Founds a watchmaking school and a casing business with André Perret.
- 1931
- The first watches carry the Louis Erard name.
- 1991
- Sold, with production moving to Le Noirmont.
- 2003
- Relaunched under Alain Spinedi around mechanical watches.
- 2020
- Collaborations with independent watchmakers define the brand.
Also in 5 collections
This watch appears in Back in Stock (3,434), Stainless Steel Watches (2,782), Automatic Watches (1,540), Silver Dial Watches (622) and Limited Edition Watches (187).
Manufacturer’s guarantee
What the specifications mean
A mechanical watch for everyday wear.
Strengths
- 40mm suits most wrists
- 8.95mm is unusually slim for a 40mm case
- 41.5mm lug-to-lug keeps the 40mm case wearable
- Sapphire crystal, which resists scratching
- Luminous hands and markers for low light
Worth knowing
- 50m suits rain and handwashing, not swimming
Louis Erard 2340 Louis Erard X alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | 35123TA23.BMT12 | BMM0A10758 | SBGM255 |
|---|---|---|---|
| Price | £4,390 | £4,450 | £4,550 |
| Case size | 40mm | 39mm | 39.5mm |
| Water resistance | 50m | 50m | 30m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Stainless steel bracelet | Leather strap | Leather strap |
| Power reserve | 56 hours | 120 hours | 72 hours |
| This watch | Closely matched |
|
Your new watch
Frequently asked questions, and things you should know about this watch
Can I swim with it?
Showering yes, swimming no. 50m covers splashes and brief immersion, but a swimming stroke generates well above the pressure that figure describes.
Water resistance explainedWill the glass scratch?
Unlikely. Sapphire is second only to diamond in hardness and shrugs off everyday marking.
Sapphire, mineral and acrylic comparedDoes it need a battery?
No. It is automatic — the motion of your wrist winds it, and there is no cell to replace.
Quartz, automatic and solar comparedHow long does it run for when it's not worn?
About 56 hours fully wound — enough to survive a night off the wrist, but not a full weekend.
Will it fit my wrist?
Lug-to-lug is 41.5mm, which suits wrists from roughly 15cm (6 inches) upward.
Lug-to-lug decides fit more than case diameter does.
How to size a watch to your wristIs it a men's or women's watch?
Listed as men's, though at 40mm it sits in the range that suits anyone.
Cheapest place to buy
Goldsmiths is the only UK retailer we track stocking this reference, so there is nothing to compare it against today.
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