Sinn 103

    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

    From our database, not yet verified

    29 to 41 mm cases · 2026

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

    Collection6 references
    20 mm
    Illustration drawn to scale: 41 mm case, 20 mm lugs

    Lug widths across the line

    The Sinn 103 takes a 20 mm strap: all 6 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

    6 Sinn 103 references

    Sinn 103 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.

    • 103.035

      103 St Leather

      20 mm

      Database

      29 mmBlack dialPlatinum

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

    • 103.0614

      103 St Sa Bracelet

      20 mm

      Database

      41 mmBlack dialStainless steel

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

    • 103.231

      103 St Sa Lufthansa

      20 mm

      Database

      41 mm2026Grey dialStainless steel

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

    • 103.071

      103 Ti Ar

      20 mm

      Database

      Steel

      Attachment
      Strap; spring bars
      Style
      pilot
      Movement
      Automatic chronograph
      Caseback
      Solid back
      Status
      Listed in our database, not yet verified

    • 103.078

      103 Ti DIAPAL

      20 mm

      Database

      Steel

      Attachment
      Strap; spring bars
      Style
      pilot
      Movement
      Automatic chronograph
      Caseback
      Solid back
      Status
      Listed in our database, not yet verified

    • 103.079

      103 Ti TESTAF

      20 mm

      Database

      Steel

      Attachment
      Strap; spring bars
      Style
      pilot
      Movement
      Automatic chronograph
      Caseback
      Solid back
      Status
      Listed in our database, not yet verified

    FAQ

    What lug width does the Sinn 103 use?

    The Sinn 103 takes a 20 mm strap: all 6 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 Sinn 103 lug widths come from?

    From our database, which lists 6 Sinn 103 references, 6 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 Sinn collections

    All Sinn 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.