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    Frederique Constant Classics Slimline Heart Beat

    Every reference with a known width takes the same strap size. Your reference is engraved on the case back or between the lugs at 6 o'clock.

    20 mm

    Not yet verified

    Attachment: spring bars

    40 mm case

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    Indicative information. Check your watch before buying a strap: whatsmylugwidth.com is not responsible for an incorrect size.

    Collection3 references
    20 mm
    Illustration drawn to scale: 40 mm case, 20 mm lugs

    Lug widths across the line

    The Frederique Constant Classics Slimline Heart Beat takes a 20 mm strap: all 3 references with a listed width in our database use 20 mm. Check the reference on your case back to be sure.

    Filter references by lug width

    3 Frederique Constant Classics Slimline Heart Beat references

    Frederique Constant Classics Slimline Heart Beat references in our database. Each card says where its width comes from: listed by the maker (linked to the maker's page in the details), two independent sources agree, or listed in our database and not yet verified by us.

    • FC‑312N4S6

      Classics Slimline Heart Beat Classics Classics Slimline Heart Beat Watch

      20 mm

      Not yet verified Spring bars

      40 mmBlue dialStainless steel

      Attachment
      classic lugs
      Status
      Listed in our database, not yet verified

    • FC‑312S4S6

      Classics Slimline Heart Beat Classics Classics Slimline Heart Beat Watch

      20 mm

      Not yet verified Spring bars

      40 mmWhite dialStainless steel

      Attachment
      classic lugs
      Status
      Listed in our database, not yet verified

    • FC‑312V4S4

      Classics Slimline Heart Beat Classics Classics Slimline Heart Beat Watch

      20 mm

      Not yet verified Spring bars

      40 mmWhite dialStainless steel

      Attachment
      classic lugs
      Status
      Listed in our database, not yet verified

    FAQ

    What lug width does the Frederique Constant Classics Slimline Heart Beat use?

    The Frederique Constant Classics Slimline Heart Beat takes a 20 mm strap: all 3 references with a listed width in our database use 20 mm. Check the reference on your case back to be sure. These widths come from our database and are not yet verified.

    Where do these Frederique Constant Classics Slimline Heart Beat lug widths come from?

    From our database, which lists 3 Frederique Constant Classics Slimline Heart Beat references, 3 of them with a listed width. Each reference card says whether the maker lists the width, two independent sources agree on it, or it is not yet verified.

    Other Frederique Constant collections

    All Frederique Constant collections

    Help

    What is lug width?

    The gap between the two lugs that hold the strap, in millimetres. A new strap must match it exactly: 20 mm lugs take a 20 mm strap.

    Measure it in 30 seconds

    1. Take the strap off, or look at the back of it: many straps print their width.
    2. Measure the inside gap between the lugs with a caliper or a millimetre ruler.
    3. Round to the nearest whole millimetre. Most watches use 18, 20 or 22 mm.

    Strap, quick release or system?

    Most watches use spring bars, so any strap of the right width fits. Many smartwatches use their own band system instead, such as Apple Watch bands or Garmin QuickFit.