Frederique Constant Classics Index Automatic

    The strap size depends on the reference. Yours is engraved on the case back or between the lugs at 6 o'clock.

    18 or 20 mm

    Listed by the maker for ref. FC‑303NN5B6B, FC‑530G3B6 and 3 more

    39 to 40 mm cases

    Filter references by lug width
    Find your exact reference

    Official page: Frederique Constant

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

    Collection8 references
    20 mm
    Illustration drawn to scale: 40 mm case, 20 mm lugs

    8 Frederique Constant Classics Index Automatic references

    Frederique Constant Classics Index Automatic 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‑303GR5B6B

      Classics Index Automatic

      20 mm

      Database

      40 mmGreen dialStainless steel

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

    • FC‑303NS5B6

      Classics Index Automatic

      20 mm

      Database

      40 mmWhite dialStainless steel

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

    • FC‑303NN5B6B

      Classics Index Automatic Blue Steel Bracelet

      20 mm

      Maker

      40 mmBlue dialStainless steel

      Style
      dress
      Movement
      Automatic
      Caseback
      Screw-down steel
      Production
      2018, present
      Status
      Listed by the maker

    • FC‑530CR3B6B

      Classics Index Automatic Cream Steel Bracelet

      18 mm

      Maker

      39 mmBeige dialStainless steel

      Style
      dress
      Movement
      Automatic
      Caseback
      Screw-down steel
      Production
      2018, present
      Status
      Listed by the maker

    • FC‑530G3B6

      Classics Index Automatic Classics Index Small Seconds Automatic Blue Brown Leather

      20 mm

      Maker

      40 mmBlue dialStainless steel

      Style
      dress
      Movement
      Automatic
      Caseback
      Screw-down steel
      Production
      2018, present
      Status
      Listed by the maker

    • FC‑303NB5B6

      Classics Index Automatic Black

      20 mm

      Maker

      40 mmBlack dialStainless steel

      Style
      dress
      Movement
      Automatic
      Caseback
      Screw-down steel
      Production
      2018, present
      Status
      Listed by the maker

    • FC‑303MC5B6

      Classics Index Automatic Silver Rose Gold

      20 mm

      Maker

      40 mmSilver dialStainless steel

      Style
      dress
      Movement
      Automatic
      Caseback
      Screw-down steel
      Production
      2018, present
      Status
      Listed by the maker

    • FC‑303MC5B4

      Classics Index Automatic Roman Numerals

      20 mm

      Database

      40 mmSilver-Tone dialRose-gold plated stainless steel

      Attachment
      Leather strap
      Style
      dress
      Movement
      Automatic
      Caseback
      Screw-down steel
      Production
      2018, present
      Status
      Listed in our database, not yet verified

    FAQ

    What lug width does the Frederique Constant Classics Index Automatic use?

    Frederique Constant Classics Index Automatic lug width: 18 or 20 mm depending on the reference. The most common is 20 mm (7 of the 8 references with a listed width in our database). Find your exact reference in the table below. The Frederique Constant Classics Index Automatic ref. FC-530CR3B6B takes 18 mm (listed by the maker). The Frederique Constant Classics Index Automatic ref. FC-303NN5B6B, FC-530G3B6 and 2 more take 20 mm (listed by the maker).

    Do all Frederique Constant Classics Index Automatic 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 Index Automatic lug widths come from?

    From our database, which lists 8 Frederique Constant Classics Index Automatic references, 8 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.