IWC Portofino Automatic 37

    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.

    18 mm

    Listed by the maker for ref. IW658601

    37 mm case

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    Official page: IWC

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

    Collection10 references
    18 mm
    Illustration drawn to scale: 37 mm case, 18 mm lugs

    Lug widths across the line

    The IWC Portofino Automatic 37 takes a 18 mm strap: all 10 references with a listed width in our database use 18 mm. Check the reference on your case back to be sure.

    Filter references by lug width

    10 IWC Portofino Automatic 37 references

    IWC Portofino Automatic 37 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.

    • IW458119

      Portofino Automatic 37 Portofino

      18 mm

      Database

      37 mmWhite dial

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

    • IW4581‑01

      Portofino Automatic 37 Portofino

      18 mm

      Database

      37 mmGrey dial

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

    • IW4581‑02

      Portofino Automatic 37 Portofino

      18 mm

      Database

      37 mmGrey dial

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

    • IW4581‑06

      Portofino Automatic 37 Portofino

      18 mm

      Database

      37 mmGrey dial

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

    • IW4581‑09

      Portofino Automatic 37 Portofino

      18 mm

      Database

      37 mmGrey dial

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

    • IW4581‑08

      Portofino Automatic 37 Portofino

      18 mm

      Database

      37 mmGrey dial

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

    • IW4581‑10

      Portofino Automatic 37 Portofino

      18 mm

      Database

      37 mmGrey dial

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

    • IW4581‑07

      Portofino Automatic 37 Portofino

      18 mm

      Database

      37 mmGrey dial

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

    • IW4581‑04

      Portofino Automatic 37 Portofino

      18 mm

      Database

      37 mmGrey dial

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

    • IW658601

      Portofino Automatic 37 Schaffhausen Portofino Automatic 37 37mm Steel Leather Silver

      18 mm

      Maker

      37 mmSilver plated dialStainless steel

      Attachment
      classic lugs
      Status
      Listed by the maker

    FAQ

    What lug width does the IWC Portofino Automatic 37 use?

    The IWC Portofino Automatic 37 takes a 18 mm strap: all 10 references with a listed width in our database use 18 mm. Check the reference on your case back to be sure. The IWC Portofino Automatic 37 ref. IW658601 takes 18 mm (listed by the maker).

    Where do these IWC Portofino Automatic 37 lug widths come from?

    From our database, which lists 10 IWC Portofino Automatic 37 references, 10 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 IWC collections

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    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.