Tap the image to enlarge
Louis Erard Le Régulateur x Konstantin Chaykin Time Eater III Limited Edition 42mm Mens Watch Grey
Ref. 85237AA90.BGA087
Sits in Louis Erard’s upper tier here — more premium than three quarters of the Louis Erard watches we list, which start at £1,975.
Price range £1,975 to £17,500 across 29 Louis Erard watches in stock.A 42mm stainless steel case, polished across three parts and fitted with a domed sapphire crystal carrying double-sided anti-reflective coating, houses one of 178 examples of this collaboration between Louis Erard and independent watchmaker Konstantin Chaykin. The dial arranges its functions in regulator fashion: a white hour disc at twelve displays the current hour through a single rotating "eye", a long central hand sweeps the blue hour-circle for minutes, and a star-shaped seconds disc at six completes the monster-face composition. The grey lower plate carries a sunray-wave finish, with an anthracite satin-finished hour flange and a red seconds flange adding further layers of depth. Beneath, the Sellita SW266-1 automatic runs at 4Hz with a 38-hour power reserve. The black toad leather strap, lined in blue rabbit leather with blue attachment points and quick-release bars, fastens with a polished steel pin buckle.
- Reference
- 85237AA90.BGA087
- Brand
- Louis Erard
- Case size
- 42mm
- Case thickness
- 12.25mm
- Lug width
- 22mm
- Case material
- Stainless steel
- Case shape
- Round
- Dial
- Grey
- Crystal
- Sapphire
- Movement
- Automatic
- Calibre
- SW266-1
- Functions
- Small seconds
- Water resistance
- 50m
- Bracelet / strap
- Leather strap
- Strap colour
- Black
- Clasp
- Buckle
- Retailer
- Mappin & Webb
Additional specifications
- Lug-to-lug
- 49.60mm
- Power reserve
- 38 hours
- Strap
- Interchangeable
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 Stainless Steel Watches (2,706), Automatic Watches (1,549), Leather Strap Watches (883), Grey Dial Watches (223) and Limited Edition Watches (183).
What the specifications mean
A mechanical watch for everyday wear.
Strengths
- Sapphire crystal, which resists scratching
- One of Louis Erard's more premium watches
Worth knowing
- 50m suits rain and handwashing, not swimming
- 38-hour reserve means winding it after a day off
Louis Erard Le Régulateur x Konstantin alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | 85237AA90.BGA087 | R32157152 | 128677 |
|---|---|---|---|
| Price | £4,950 | £5,150 | £4,500 |
| Case size | 42mm | 42mm | 42mm |
| Water resistance | 50m | 50m | 50m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Leather strap | Ceramic bracelet | Stainless steel bracelet |
| Power reserve | 38 hours | 80 hours | 50 hours |
| This watch | Closely matched | 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 38 hours fully wound — so it will usually stop if you leave it off overnight.
What size strap does it take?
22mm. Any strap of that width will fit, and on most modern watches quick-release bars make the swap a two-minute job with no tools.
Will it fit my wrist?
Lug-to-lug is 49.60mm, which suits wrists from roughly 16.5cm (6½ 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.
Cheapest place to buy
Mappin & Webb is the only UK retailer we track stocking this reference, so there is nothing to compare it against today.
More Louis Erard watches like the Le Régulateur x Konstantin
In stock, and close on style and price
