Frederique Constant

Slimline Hearts Beat Automatic 42mm

Name: Frederique Constant Slimline Hearts Beat Automatic 42mm FC-310WHTS5B6
Brand: Frederique Constant
SKU: FC-310WHTS5B6

Ref. FC-310WHTS5B6

2016–present · 42mm · caliber Frederique Constant Cal. FC-310: in-house automatic with heartbeat aperture, 28,800bph, 38h PR, 26j; partial dial aperture at 6 o'clock exposes the balance wheel; accessible FC manufacture

Find similar

Mass-produced#2 in family

Live pricing is coming soon. Get notified when it is available for this reference.

Movement tier: unclassified · caliber Frederique Constant Cal. FC-310: in-house automatic with heartbeat aperture, 28,800bph, 38h PR, 26j; partial dial aperture at 6 o'clock exposes the balance wheel; accessible FC manufacture · 38h power reserve

Medium-large: suits wrists 6.5 in+ (16.5 cm+)

42 mm case. Wears confidently on average to larger wrists. May overhang on slender builds.

Not yet rated

Community + OSINT signals haven’t landed for this reference yet. We don’t publish a rating against zero signal: the number would mean nothing. Editorial body + caliber + market value still surface above; ratings appear once the signal corpus does.

Search pre-owned listings

Chrono24

eBay (sold listings)

WatchBox

Authentication

The open-worked heart aperture at 12 must reveal the oscillating balance wheel; a solid dial where the aperture should be indicates a dial replacement.

Known issues in the market

Any Hearts Beat with a solid dial covering the heart aperture has had the dial replaced with a non-genuine component.
The balance wheel must be visibly oscillating through the aperture; a stopped movement is immediately apparent.

Area	What to check	What is correct	Red flag
dial	Heart-shaped aperture	Open heart-shaped aperture at 12 revealing the oscillating balance wheel below	Solid dial at 12; aperture covered or missing; non-genuine dial
dial	Balance wheel visibility	Balance wheel visible and oscillating through the heart aperture	Non-oscillating balance wheel; movement stopped or severely low power
case	Case proportions	Correct 42mm Hearts Beat case profile with slim proportions	Incorrect case proportions; wrong Hearts Beat sub-reference

Common legitimate replacements

Leather strap; FC OEM.
Crystal; sapphire standard.

Expert resources: Frederique Constant authorized service; FC Slimline Hearts Beat product documentation.

Authentication guide

Last reviewed June 2026

The Hearts Beat has a dial aperture at 6 o'clock exposing the oscillating balance wheel; this open-heart window is the primary visual and authentication anchor.

Known reproduction risks

toggle

LOW

Not a reproduction target; open-heart references at this price point rarely attract fakes.

The aperture frame is a precision-cut part; rough edges or sealant residue around the window suggest modification.

Dial variants by era

toggle

Era	Description	Identifiers
2016 to present	White or silver dial with open-heart aperture at 6 o'clock; applied indices; no date on most variants. Steel and rose gold case options.	FC-310 caliber with heartbeat aperture Open-heart window at 6 o'clock showing oscillating balance wheel Applied baton indices; leaf or baton hands

Service part flags

toggle

Heartbeat aperture

Original: Clean circular or shaped aperture at 6 o'clock; the balance wheel oscillates visibly; the bridge framing the aperture is part of the dial structure.

Replacement tells

A dial without the aperture cannot be the original Hearts Beat dial.
The aperture frame should be smooth and clean; a poorly cut or rough edge indicates a modified dial.

Balance wheel

Original: The balance wheel visible through the aperture should oscillate evenly at 28,800bph; 4 beats per second.

Replacement tells

Irregular oscillation visible from the front may indicate a regulation or service issue.

Case back markings

toggle

2016 to present

FREDERIQUE CONSTANT SLIMLINE HEARTS BEAT on movement plate
FC-310 caliber designation
SWISS MADE
Display caseback on most variants showing the full movement

Movement tells

toggle

The FC-310 should show FC-signed rotor and FC manufacture finishing; the aperture in the dial is coordinated with a matching aperture cut into the movement plate.
If the movement visible through the caseback lacks an aperture cut-out aligned with the dial window, the dial or movement has been incorrectly matched.
Balance wheel should show the FC patterned rim and oscillate at 28,800bph.

Sources: Worn & Wound — FC Slimline Hearts Beat; Frédérique Constant Hearts Beat.