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    Frederique Constant Classics Open Heart

    Widths differ across this line. Enter or pick your exact reference to get its width.

    20 or 22 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.

    Collection7 references
    22 mm
    Illustration drawn to scale: 40 mm case, 22 mm lugs

    7 Frederique Constant Classics Open Heart references

    Frederique Constant Classics Open Heart 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‑315M4P5

      Classics Open Heart Classics Open Heart Watch

      22 mm

      Not yet verified Spring bars

      40 mmWhite dialStainless steel

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

    • FC‑315M4P6

      Classics Open Heart Classics Open Heart Watch

      22 mm

      Not yet verified Spring bars

      40 mmSilver dialStainless steel

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

    • FC‑315M4P6B2

      Classics Open Heart Classics Open Heart Watch

      22 mm

      Not yet verified Spring bars

      40 mmSilver dialStainless steel

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

    • FC‑315M4P6B3

      Classics Open Heart Classics Open Heart Watch

      22 mm

      Not yet verified Spring bars

      40 mmSilver dialStainless steel

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

    • FC‑315MPB3P6B

      Classics Open Heart Classics Open Heart Watch

      20 mm

      Not yet verified Spring bars

      40 mmMother of pearl dialStainless steel

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

    • FC‑315MS3P6B

      Classics Open Heart Classics Open Heart Watch

      20 mm

      Not yet verified Spring bars

      40 mmWhite dialStainless steel

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

    • FC‑315NS3P6B

      Classics Open Heart Classics Open Heart Watch

      20 mm

      Not yet verified Spring bars

      40 mmBlue dialStainless steel

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

    FAQ

    What lug width does the Frederique Constant Classics Open Heart use?

    Frederique Constant Classics Open Heart lug width: 20 or 22 mm depending on the reference. The most common is 22 mm (4 of the 7 references with a listed width in our database). Find your exact reference in the table below. These widths come from our database and are not yet verified.

    Do all Frederique Constant Classics Open Heart references take the same strap?

    No. 2 different lug widths appear across the line, often by case size or generation. Check the reference engraved on the case back or between the lugs.

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

    From our database, which lists 7 Frederique Constant Classics Open Heart references, 7 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.