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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.
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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
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
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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
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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
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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
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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
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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.
