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Baume & Mercier Riviera Automatic 39mm Mens Watch Green
Ref. M0A10770
Sits in Baume & Mercier’s upper tier here — more premium than three quarters of the Baume & Mercier watches we list, which start at £850.
Price range £850 to £18,000 across 34 Baume & Mercier watches in stock.The Riviera was first drawn in 1973, and the twelve-sided bezel secured by four exposed screws has remained its defining mark ever since. This 39mm version, introduced in 2024, brings the case down from the 42mm that had become standard, and the difference is meaningful: it sits closer to the wrist, reads more cleanly under a cuff, and opens the collection to a wider range of wrists without altering the design's character. What makes this particular variant worth attention is the dial, which is a smoky green sapphire that offers a partial view of the movement beneath without resorting to a full skeleton layout. The rose-gold hands read well against it in most light, and the Roman numerals hold legibility where an all-open dial would lose it. Powering the watch is the Baumatic BM14-1975A, built by ValFleurier within the Richemont group exclusively for Baume & Mercier. Its 120-hour power reserve means a watch left off the wrist on Friday will still be running on Wednesday, and the calibre carries strong resistance to magnetic fields — practical for daily wear in a way that never needs to be thought about. The bracelet swaps tool-free for rubber or leather alternatives, and the triple-folding clasp with push-piece security is the kind of fastening that closes with enough confidence to suggest it will still feel right years from now.
- Reference
- M0A10770
- Brand
- Baume & Mercier
- Collection
- Riviera
- Case size
- 39mm
- Case thickness
- 10.21mm
- Case material
- Stainless steel
- Case shape
- Octagonal
- Dial
- Green
- Crystal
- Sapphire
- Movement
- Automatic
- Calibre
- Baumatic BM14-1975A
- Functions
- Date
- Water resistance
- 100m
- Bracelet / strap
- Stainless steel bracelet
- Strap colour
- Silver
- Clasp
- Folding clasp
- Lume
- Super-LumiNova
- Retailer
- Mappin & Webb
Additional specifications
- Power reserve
- 120 hours
- Origin
- Swiss made
- Strap
- Interchangeable
Learn more about Baume & Mercier
The Baume brothers opened a watchmaking business in Les Bois in the Swiss Jura in 1830, and built a substantial export operation through a London office. The company won significant honours at nineteenth-century observatory trials, including a record for a chronograph tourbillon at Kew that stood for years.
The modern company dates from 1918, when William Baume partnered with Paul Mercier in Geneva. Mercier brought design sensibility, and the house's Art Deco pieces of the 1920s — shaped cases, jewelled dials, and the Phi emblem representing the golden ratio — established a decorative direction it has largely kept.
Baume & Mercier was among the founding members of the Geneva Seal system and produced complications including minute repeaters and perpetual calendars in its earlier decades.
Its modern position is deliberately accessible: classical Swiss watchmaking at prices below the group's luxury tier, with the Clifton, Riviera, and Hampton collections covering round dress watches, integrated-bracelet sports watches, and rectangular Art Deco shapes respectively. The Riviera, introduced in 1973, was among the first steel luxury sports watches with an integrated bracelet, arriving a year after the Royal Oak.
The house has been part of Richemont since the group's formation, and produces around two hundred thousand watches annually.
- 1830
- The Baume brothers begin watchmaking in Les Bois.
- 1892
- A Kew observatory record is set with a chronograph tourbillon.
- 1918
- William Baume and Paul Mercier partner in Geneva.
- 1973
- The twelve-sided Riviera launches.
Also in 5 collections
This watch appears in the Baume & Mercier Riviera range (14), Stainless Steel Watches (2,624), Back in Stock (1,916), Automatic Watches (1,472) and Green Dial Watches (346).
What the specifications mean
A mechanical watch for everyday wear.
Strengths
- 100m water resistance covers swimming and watersports
- 39mm suits most wrists
- Sapphire crystal, which resists scratching
- 120-hour reserve survives a weekend off the wrist
- Luminous hands and markers for low light
Baume & Mercier Riviera alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | M0A10770 | 01 400 7778 7155-07 7 20 01TLC | L38021536 |
|---|---|---|---|
| Price | £3,600 | £3,500 | £3,900 |
| Case size | 39mm | 39mm | 39mm |
| Water resistance | 100m | 100m | 100m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Stainless steel bracelet | Titanium bracelet | Titanium bracelet |
| Power reserve | 120 hours | 120 hours | 72 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.
Will the glass scratch?
Unlikely. Sapphire is second only to diamond in hardness and shrugs off everyday marking.
Does it need a battery?
No. It is automatic — the motion of your wrist winds it, and there is no cell to replace.
How long does it run for when it's not worn?
About 120 hours fully wound — enough to sit off the wrist over a weekend and still be running.
Is it a men's or women's watch?
Listed as men's, though at 39mm it sits in the range that suits anyone.
Cheapest place to buy
Mappin & Webb is the only UK retailer we track stocking this reference new, at £3,600. There is nothing to compare it against today.
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