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The Frederique Constant Slimline Monolithic Manufacture pairs a traditional-looking dress-watch design with an unusual regulator: a flexible, one-piece silicon oscillator that runs at 40 Hz. The FC-810 is an automatic manufacture calibre with a stated 80-hour power reserve. The available sources establish its design and specifications, but not a hands-on assessment or an independently measured accuracy result.
What is the Slimline Monolithic Manufacture?
It is a Frederique Constant automatic watch built around the FC-810 calibre and its monolithic silicon oscillator. The 40 Hz frequency is the oscillator’s rate—not a claim that the watch is proven to keep time more accurately in everyday use. The brand equates 40 Hz with 288,000 vibrations per hour; for comparison, it gives 28,800 vibrations per hour as a rate found in many traditional mechanical movements. Frederique Constant’s product information and its 2021 consumer brochure document the model and frequency.
How does the 40 Hz silicon oscillator work?
A mechanical watch draws energy from its mainspring, sends it through a gear train, and meters its release through an escapement governed by an oscillator. In a conventional movement, a balance wheel and hairspring perform that regulating role. The FC-810 instead uses a compact silicon structure whose flexures bend and spring back as it oscillates.
Frederique Constant says the single silicon component replaces 26 standard assortment components and incorporates the anchor into its flexible structure. Two weights on the component allow a watchmaker to adjust the rate. The manufacturer credits Flexous with helping develop the flexible oscillator, in a collaboration initiated by Peter Stas and Dr Nima Tolou.
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- The perfect ladies classic timepiece with a rose-gold plated stainless steel case featuring a silver colored dial with guilloché decoration and black printed roman numerals on a brown leather strap.
- Anti-Reflective Sapphire Crystal
- Silver-Tone dial
- 3 Year warranty
A 2021 engineering article in Mikroniek describes the oscillator as 9.8 mm in diameter and 0.3 mm thick, with a 6-degree amplitude. It also explains that the FC-810 gear train was altered to accommodate the regulator’s higher frequency. Frederique Constant describes the compact dimensions this way: “The new topology of the flexures and masses has permitted the creation of an unprecedented compact size for a flexure pivot oscillator (9.8mm in diameter and 0.3mm in thickness).” These are manufacturer and engineering-article descriptions, not independent performance measurements. Read the Mikroniek engineering article.
Does 40 Hz make the watch more accurate?
Not by itself, based on the available evidence. A higher oscillator frequency is a defining technical feature, but it does not establish a particular real-world accuracy result. No independent accuracy test or measured daily rate is documented here, so the 40 Hz figure should be read as a movement specification rather than a guarantee of superior timekeeping.
Rank #2
- Round watch with slender stick hour markers featuring logo under 12 o'clock, fluted crown, and moon phase window
- 42 mm rose gold-plated stainless steel case with antireflective-sapphire dial window
- Swiss automatic movement with analog display
- Croco-embossed leather band with buckle closure
- Water resistant to 30 m (99 ft): In general, withstands splashes or brief immersion in water, but not suitable for swimming.
The sources do establish the manufacturer’s stated 80-hour power reserve. They do not supply a test protocol or independent verification for that figure. For context on the oscillator concept and launch, Jack Forster’s Hodinkee technical overview describes it as a flexible, one-piece silicon component rather than a conventional balance and hairspring.
What does the watch look like?
The mechanism sits inside a classically styled 40 mm round case. The dial combines Roman numerals and Breguet-style hands with two functional openings: a pointer date at 12 o’clock and a view of the oscillator at 6. An exhibition caseback reveals the movement from the reverse. The contrast is deliberate: a restrained dress-watch face frames a conspicuously modern regulator.
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- Blue moon phase dial
- Stainless steel case and bracelet
- Swiss-automatic movement
- Case diameter: 42mm
- Water resistant to 99 feet
Which FC-810 references were documented?
Frederique Constant’s 2021 brochure lists three limited editions. The edition counts and strap descriptions below are historical brochure specifications, not confirmation that any reference remains available.
| Reference | Case and strap | Edition size |
|---|---|---|
| FC-810MC3S6 | Steel case; black alligator strap | 810 pieces |
| FC-810MCN3S6 | Steel case; dark blue alligator strap | 810 pieces |
| FC-810MC3S9 | 18K rose-gold case; dark brown alligator strap | 81 pieces |
Reference spellings and edition details should be checked against the specific watch and seller documentation, especially when buying pre-owned.
Rank #4
- Silver moon phase dial
- Stainless steel case and bracelet
- Swiss-automatic movement
- Case diameter: 42mm
- Water resistant to 99 feet
What are the recorded specifications and historical price?
The Grand Prix d’Horlogerie de Genève entry for FC-810MC3S6 records a 40 mm diameter, 11.38 mm thickness, 30 m water resistance, automatic movement, and 80-hour reserve. It also records a price of 4,895 CHF including VAT, associated with the June 2021 launch. That is historical listing information, not a current retail quote or evidence of present stock. See the GPHG entry.
For a current purchase, confirm the exact reference, case material, edition documentation, condition, and seller’s current price. The cited records do not establish a current offer or availability.
Quick Recap
Best Value
- Round silver-tone watch with sunray dial featuring intricate moon-phase display with date-tracking sub-dial
- Caliber FC-703, Incabloc anti-shock system
- 39 mm stainless steel case with anti-reflective sapphire dial window
- Swiss automatic movement with 42-hour power reserve and analog display
- Stainless steel band with deployant clasp and double push-button closure
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
