Name: Ferdinand Berthoud Chronomètre FB 2RE FB 2RE.2
Brand: Ferdinand Berthoud
SKU: FB 2RE.2

The FB 2RE puts acoustic resonance into a 38mm steel package at a fraction of what F.P. Journe's Résonance commands. Two balance wheels share a resonance bridge and naturally synchronize, giving the watch exceptional rate stability without electronic regulation. For a collector who wants real horological substance in a wearable size, very little at this price level competes.

What it is

François-Baptiste is a brand that emerged from the orbit of F.P. Journe's Geneva atelier, applying the same serious approach to complications to a more accessible price point. The FB 2RE launched around 2020, making it one of only a handful of resonance wristwatches ever brought to commercial production.

The resonance principle dates to Antide Janvier and Abraham-Louis Breguet in the 18th century: two oscillators coupled through a bridge will synchronize and mutually correct each other's rate errors. Most watchmakers have left the concept as a curiosity; FB built a working hand-wound caliber around it in a 38mm steel case sized for the wrist rather than the display cabinet.

Buying notes

The market for FB 2RE is thin, which makes pricing opaque and resale unpredictable. Buyers should be cautious about examples that show signs of amateur service, because the resonance bridge requires precise setup; a poorly regulated resonance watch delivers no rate benefit at all. The hand-wound movement needs winding every day or two, and skipping that routine can disrupt the synchronized oscillator relationship until the watch settles back in.

Dial variants exist, so confirm you are looking at the specific reference and dial you want rather than assuming all 2RE examples are equivalent. The brand's limited dealer network means pre-sale inspection may require shipping, which adds friction to the due-diligence process.

Market read

Pre-owned FB 2RE examples trade in a range significantly below the cost of an F.P. Journe Résonance, making this the most accessible entry point for a genuine resonance wristwatch. Liquidity is limited by the brand's low production numbers and niche recognition, so buyers have real negotiating room but sellers may wait for the right buyer.

Condition and service history matter more than usual given the complexity of the resonance caliber.

Service expectations

The FB 2RE runs the hand-wound FB-RE.FC caliber with the paired-oscillator resonance bridge. Service should go to FB-authorized technicians or an independent with documented experience on resonance movements; re-establishing correct resonance coupling after disassembly is not routine work. Budget accordingly and ask any prospective watchmaker specifically about their experience with the caliber before committing.

Editorial copy is AI-drafted from primary sources and reviewed by Grail Atlas before publication. Where the text is uncertain about a fact, it says so. Email corrections@grailatlas.com if something reads wrong. Signals on this page (community, OSINT) are clearly separated from the editorial sections.

Mass-produced#1 in familyOfficial press photos

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In-house manufacture caliber · caliber FB-RE.FC (hand-wound, in-house, regulator-style dial)

Versatile size: fits most wrists (6–7.5 in / 15–19 cm)

38 mm case. The sweet spot for the broadest range of wrist sizes. Neither too dainty nor too bold.

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Authentication

The FB 2RE has a regulator-style dial with separate subdials for hours, minutes, and seconds; any configuration with a central minute hand is not a genuine FB 2RE.

Known issues in the market

Independent Geneva maker; movement finishing must meet the standard expected from an independent manufacture, verifiable under a loupe.
These pieces are rare on the secondary market; establish provenance through FB directly before purchase.

Area	What to check	What is correct	Red flag
dial	Regulator layout configuration	Hours and minutes on separate subdials; no central minute hand	Central minute hand present; non-genuine configuration
movement	In-house Cal. FB-RE.FC finishing	Hand-finished movement surfaces consistent with independent Geneva standard; sharp chamfers under loupe	Machined finishes not hand-done; finishing does not meet independent maker standard
dial	Subdial register arrangement	Regulator layout consistent with FB 2RE specification	Register arrangement inconsistent with FB 2RE documentation

Common legitimate replacements

Crown; FB-signed only.

Expert resources: FB direct; independent Geneva watchmaker networks for secondary market provenance.

Authentication guide

Last reviewed June 2026

The Ferdinand Berthoud FB 2RE is a tourbillon marine chronometer revival built by a Chopard subsidiary. The movement architecture, based on two concentric barrels driving a constant-force remontoir and tourbillon, is completely unique in current production.

Known reproduction risks

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LOW

No known replicas. The tourbillon and constant-force remontoir combination cannot be replicated at any commercially viable counterfeit price point.

The authentication risk here is provenance and condition, not replica watches. Request full documentation from the original retailer or Chopard/Ferdinand Berthoud.

Dial variants by era

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Era	Description	Identifiers
2015 to present	Octagonal case with crown at 12. The dial presents the tourbillon and regulator prominently; this is a technical display piece, not a dress watch. The verge-style balance and constant-force mechanism are visible through the dial apertures.	"FERDINAND BERTHOUD FLEURIER" on dial Tourbillon cage visible at the dial center or lower half depending on configuration The constant-force remontoir spring is part of the display architecture

Service part flags

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Tourbillon cage

Original: The tourbillon is a statement piece in its own right; the cage construction is open and architectural. Any service to the tourbillon should be performed by the Ferdinand Berthoud atelier or an approved repairer.

Replacement tells

Cage geometry inconsistent with reference photographs from the manufacturer
Replacement cage components from a different finishing run (color or stroke-width inconsistency)

Constant-force remontoir

Original: The remontoir spring is visible and is part of the display. Its geometry is specific to this caliber and not interchangeable with generic parts.

Replacement tells

A remontoir spring that does not match the catalog geometry
Any evidence of improvised repair (adhesive, bent blade, incorrect spring gauge)

Case back markings

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2015 to present

"FERDINAND BERTHOUD FLEURIER" on caseback
Serial number and limited-edition notation if applicable
Exhibition caseback showing the movement; the two concentric barrels are visible from the rear

Movement tells

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The two concentric barrels are the defining visual from the caseback. Both should be visible and properly seated; a single-barrel configuration indicates a different movement entirely.
The constant-force mechanism produces a characteristic amplitude consistency; a watchmaker can verify this with a timing machine across the power reserve.
The movement finishing is Chopard-standard: Geneva stripes, polished bevels, and a consistent surface quality across all components.
Service records should trace back to the Fleurier atelier. This is a low-production complication piece; authorized service centers are limited.

Sources: Ferdinand Berthoud official site; Hodinkee — FB 2RE coverage.