Fortis Official Cosmonauts

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

    20 or 22 mm

    Two sources agree on ref. 647.27.11

    42 to 44 mm cases · 2018 to 2020

    Filter references by lug width
    Find your exact reference
    Report an error

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

    Collection10 references
    20 mm
    Illustration drawn to scale: 42 mm case, 20 mm lugs

    10 Fortis Official Cosmonauts references

    Fortis Official Cosmonauts 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.

    • F2040004

      Official Cosmonauts Amadee-18 Black

      20 mm

      Database

      44 mm2018Black/Orange dialTitanium

      Attachment
      screwed bars
      Movement
      Automatic
      Caseback
      Screw titanium
      Production
      2018, present
      Status
      Listed in our database, not yet verified

    • AMADEE20‑GR‑2020

      Official Cosmonauts Amadee-20 Grey

      22 mm

      Database

      44 mm2020Grey dialTitanium

      Attachment
      screwed bars
      Movement
      Automatic
      Caseback
      Screw titanium
      Production
      2020, present
      Status
      Listed in our database, not yet verified

    • 638.18.31

      Official Cosmonauts Chronograph Monolith

      20 mm

      Database

      42 mmBlack dialStainless Steel

    • 647.10.11

      Official Cosmonauts Day-Date

      20 mm

      Database

      42 mmBlack dialStainless Steel

    • B‑42‑647.10.11

      Official Cosmonauts Day-Date Black

      20 mm

      Database

      42 mmBlack dialSteel

      Attachment
      classic lugs
      Movement
      Automatic day-date
      Caseback
      Screw steel
      Production
      2001-2015
      Status
      Listed in our database, not yet verified

    • B‑42‑647.10.41

      Official Cosmonauts Day-Date Blue

      20 mm

      Database

      42 mmBlack/Blue dialSteel

      Attachment
      classic lugs
      Movement
      Automatic day-date
      Caseback
      Screw steel
      Production
      2005-2015
      Status
      Listed in our database, not yet verified

    • 647.28.13

      Official Cosmonauts Day-Date Mars 500

      20 mm

      Database

      42 mmBlack dialTitanium

    • 647.18.31

      Official Cosmonauts Day-Date Monolith

      20 mm

      Database

      42 mmBlack dialStainless Steel

    • 647.28.81

      Official Cosmonauts Day-Date Pitch Black

      20 mm

      Database

      42 mmBlack dialTitanium

    • 647.27.11

      Official Cosmonauts Titanium Day-Date

      20 mm

      Two sources

      42 mmBlack dialTitanium

    FAQ

    What lug width does the Fortis Official Cosmonauts use?

    Fortis Official Cosmonauts lug width: 20 or 22 mm depending on the reference. The most common is 20 mm (9 of the 10 references with a listed width in our database). Find your exact reference in the table below. The Fortis Official Cosmonauts ref. 647.27.11 takes 20 mm (two independent sources agree).

    Do all Fortis Official Cosmonauts 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 Fortis Official Cosmonauts lug widths come from?

    From our database, which lists 10 Fortis Official Cosmonauts 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 Fortis collections

    All Fortis 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.