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Louis Erard Le Régulateur x Alain Silberstein Limited Edition 40mm Unisex Watch Green
Ref. 85358TT06.BTT89
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 24 Louis Erard watches in stock.The Régulateur is the watch type that made practical sense before the minute hand existed — separating hours, minutes and seconds onto independent registers so a clockmaker could read each without one obscuring another. Louis Erard has kept that logic intact here, with the large white arrow given the full dial for minutes, the hours relegated to a subdial at twelve and the small seconds at six, then handed the whole arrangement to Alain Silberstein. He is the French architect who has spent decades arguing that watchmaking does not have to be solemn, and his signature is immediately legible: a serpentine yellow hand for the seconds, geometry where other designers would have chosen restraint. This is one of 178 examples made as part of the Triptyque Khaki series launched in late 2023. The case pairs micro-blasted grade 2 titanium for the main structure with polished grade 5 sidebars — the harder alloy used in aerospace where wear resistance matters — so the 40mm case is lighter than it looks and the finish varies across the same surface. Quick-release grade 2 titanium lugs integrate with the khaki nylon strap, meaning strap changes take seconds without tools. The Sellita SW266-1 ND running underneath is a movement modified specifically for regulator layout, which accounts for the dial architecture rather than fighting it.
- Reference
- 85358TT06.BTT89
- Brand
- Louis Erard
- Collection
- Excellence
- Case size
- 40mm
- Case thickness
- 11.5mm
- Lug width
- 22.7mm
- Case material
- Titanium
- Case shape
- Round
- Dial
- Green
- Crystal
- Sapphire
- Movement
- Automatic
- Calibre
- Sellita SW266-1 ND
- Functions
- Small seconds
- Water resistance
- 100m
- Bracelet / strap
- Fabric strap
- Strap colour
- Green
- Lume
- Luminous
- Retailer
- Mappin & Webb
Additional specifications
- Power reserve
- 38 hours
- Origin
- Swiss made
- Warranty
- 3 years
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 the Louis Erard Excellence range (5), Automatic Watches (1,645), Green Dial Watches (447), Limited Edition Watches (194) and Titanium Watches (170).
Best of 2 retailers
What the specifications mean
A mechanical watch for everyday wear.
Strengths
- 100m water resistance covers swimming and watersports
- 40mm suits most wrists
- Sapphire crystal, which resists scratching
- Luminous hands and markers for low light
- One of Louis Erard's more premium watches
Worth knowing
- 38-hour reserve means winding it after a day off
Louis Erard Le Régulateur x Alain alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | 85358TT06.BTT89 | 790 | 103844 |
|---|---|---|---|
| Price | £4,500 | £4,400 | £4,750 |
| Case size | 40mm | 40mm | 40mm |
| Water resistance | 100m | 100m | 100m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Fabric strap | Stainless steel bracelet | Rubber strap |
| Power reserve | 38 hours | 42 hours | 42 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?
Yes. At 100m it is rated for swimming and snorkelling, though not for diving.
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?
22.7mm. 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.
Is it a men's or women's watch?
Listed as unisex, and at this size it suits any wrist that takes the dimensions.
Cheapest place to buy
Both Mappin & Webb and Goldsmiths list it at £4,500, so choose on delivery and warranty rather than price.
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