Tap the image to enlarge
Louis Erard Le Régulateur Tourbillon Louis Erard X Alain Silberstein Limited Edition 40mm Mens Watch Blue
Ref. 89356TT05.BTT90
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 31 Louis Erard watches in stock.The regulator layout separates timekeeping functions across the dial: an off-centre hour sub-dial sits at 12 o'clock with grey and red transfers, while a cut-out at 6 o'clock exposes the tourbillon cage, which completes one full rotation every 60 seconds. The blue sunray main dial is ringed by a white silver opaline flange with blue and red indices. Alain Silberstein's geometric hands in bold primary colours reinforce the graphic character throughout. The 40mm case combines microblasted grade 2 titanium with a polished grade 5 titanium frame, measuring 11.8mm thick. A domed sapphire crystal with anti-reflective coating on both sides sits above, while the sapphire caseback reveals the BCP T02 movement's circular decoration and an engraved LE x AS insignia. A red-lacquered conical crown provides the winding point. The blue nylon strap fastens with a titanium hook-and-loop buckle.
- Reference
- 89356TT05.BTT90
- Brand
- Louis Erard
- Case size
- 40mm
- Case thickness
- 11.80mm
- Case material
- Titanium
- Case shape
- Round
- Dial
- Blue
- Crystal
- Sapphire
- Movement
- Manual
- Calibre
- BCP T02
- Functions
- Small seconds, Tourbillon
- Water resistance
- 100m
- Bracelet / strap
- Fabric strap
- Strap colour
- Blue
- Clasp
- Buckle
- Retailer
- Mappin & Webb
Additional specifications
- Lug-to-lug
- 47mm
- Power reserve
- 100 hours
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 3 collections
This watch appears in Blue Dial Watches (871), Limited Edition Watches (206) and Titanium Watches (180).
Best of 2 retailers
What the specifications mean
Strengths
- 100m water resistance covers swimming and watersports
- 40mm suits most wrists
- 47mm lug-to-lug keeps the 40mm case wearable
- Sapphire crystal, which resists scratching
- One of Louis Erard's more premium watches
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 hand-wound, so it needs winding every day or two but never a battery.
Quartz, automatic and solar comparedHow long does it run for when it's not worn?
About 100 hours fully wound — enough to sit off the wrist over a weekend and still be running.
Will it fit my wrist?
Lug-to-lug is 47mm, which suits wrists from roughly 16cm (6¼ 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
Both Mappin & Webb and Goldsmiths list it at £17,500, so choose on delivery and warranty rather than price.
More Louis Erard watches like the Le Régulateur Tourbillon Louis
In stock, and close on style and price
