Sinn 556

    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

    Two sources agree on ref. 556.010

    38.5 mm case

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

    Watch line12 references
    20 mm
    Illustration drawn to scale: 38.5 mm case, 20 mm lugs

    Lug widths across the line

    The Sinn 556 takes a 20 mm strap: all 12 references with a known width use 20 mm.

    Filter references by lug width

    The story · Since 2008

    The story of the Sinn 556

    1. 2016 Sunburst for the 55th For Sinn's 55th anniversary the 556 I gained a refined dress: sunburst dials, applied indices and steel sword hands.
    2. 2025 Pastel and guilloche In September 2025 Fratello reported a new round of pastel 556 models with guilloche dials, presented alongside an EZM 3 S and a 104 Classic 12.

    65 g

    weight of the 556 I head without strap

    Read the full storyHide the story
    65 gweight of the 556 I head without strap
    200pieces of the 556 I WT made for WatchTime Germany
    20 barwater and pressure resistance, with low pressure resistance

    Chapters

    1. 2016

      Sunburst for the 55th

      For Sinn's 55th anniversary the 556 I gained a refined dress: sunburst dials, applied indices and steel sword hands. A mocha dial joined the regular collection, while an anthracite version was limited to 1,000 pieces and swapped the word AUTOMATIK for 1961-2016.

    2. 2025

      Pastel and guilloche

      In September 2025 Fratello reported a new round of pastel 556 models with guilloche dials, presented alongside an EZM 3 S and a 104 Classic 12.

    Moments

    2020. In April 2020 Revolution reported the 556 A RS and 556 I RS, part of a release that also introduced the U50 diver and the dressier 1739 line.

    2017. Sinn's black mother-of-pearl 556 I was meant as a more masculine take on the material, and Worn & Wound reported it was priced on request because of the custom dial.

    2016. The 556 I Anthracite anniversary edition replaced the dial's AUTOMATIK with the dates 1961-2016, one of 1,000 pieces made for Sinn's 55th year.

    WatchTime Germany compares its 200-piece 556 I WT to a Negroni, the dial fading from red-orange to deep black; purchase was limited to one watch per order and person.

    Generations and strap changes

    1. 2025
      Four 300-piece colours

      Sinn expanded the 556 with Sand, Ice Blue, Mauve and Sage dials, each limited to 300 pieces, in the 38.5mm case.

      Offered on a canvas-Alcantara strap, a fine-link bracelet or a bracelet with micro-adjustment clasp.

    2. 2016
      Mocha and Anniversary

      At Baselworld 2016 Sinn added a mocha dial 556 I and a 1,000-piece anthracite anniversary edition marked 1961-2016.

      Offered on bracelet or shell cordovan strap; the drilled lugs ease strap changes.

    3. 2011
      556 I and 556 A

      Sinn added the 556 A with numerals at 3, 6, 9 and 12 and renamed the original the 556 I.

      Reviewers list a 38.5mm case with 20mm drilled lugs on the 556 I.

    4. 2008
      Original 556

      The 556 entered production with a black dial, bar markers and a date at 3:00; one source dates first sales to December 2007.

    About Sinn

    Founded in 1961 in Frankfurt am Main, Germany.

    The Sinn story

    12 Sinn 556 references

    Sinn 556 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.

    • 556.010

      556 I

      20 mm

      Two sources

      38.5 mm

    • 556.014

      556 A Bracelet

      20 mm

      Database

      38.5 mmBlack dialStainless steel

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

    • 556.0141

      556 A RS Bracelet

      20 mm

      Database

      38.5 mmBlack dialStainless steel

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

    • 556.0115

      556 Aquamarine Blue

      20 mm

      Database

      Steel

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

    • 556.0104

      556 I B Leather

      20 mm

      Database

      38.5 mmBlue dialStainless steel

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

    • 556.0105

      556 I Mother-of-pearl S

      20 mm

      Database

      Steel

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

    • 556.0102

      556 I Mother-of-pearl W

      20 mm

      Database

      Steel

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

    • 556.0106

      556 I RS Bracelet

      20 mm

      Database

      38.5 mmBlack dialStainless steel

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

    • 556.0121

      556 Ice Blue Limited Edition Bracelet

      20 mm

      Database

      38.5 mmLight Blue Guilloché dialStainless steel

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

    • 556.0124

      556 Mauve

      20 mm

      Database

      Steel

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

    • 556.0123

      556 Sage Limited Edition Strap

      20 mm

      Database

      38.5 mmGreen Guilloché dialStainless steel

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

    • 556.0122

      556 Sand Limited Edition Bracelet

      20 mm

      Database

      38.5 mmSand Guilloché dialStainless steel

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

    FAQ

    What lug width does the Sinn 556 use?

    The Sinn 556 takes a 20 mm strap: all 12 references with a known width use 20 mm. The Sinn 556 ref. 556.010 takes 20 mm (two independent sources agree).

    What lug width does the Sinn 556 have?

    20 mm. Sinn lists a 20 mm band lug width on the 556 I and 556 I B, both on the same 38.5 mm case.

    Are the lugs drilled for easy strap changes?

    Yes. Worn & Wound's review points out the drilled lugs, which make removing a strap or bracelet much easier.

    Which bracelets does Sinn offer for the 556?

    The 556 I is configured on a satinised solid steel bracelet; for the 2025 editions WatchTime lists a fine-link bracelet and a steel bracelet with micro-adjustment clasp, besides a canvas-Alcantara strap. Earlier reviews describe Sinn's H-link bracelet.

    How do I shorten the 556 solid bracelet?

    Sinn's manual says the links are screwed: loosen the side screw, remove or add a link, and add one small drop of medium thread-locker before tightening. Keep both sides equal, or the 12 o'clock side longer.

    How big does the 556 wear?

    The case is 38.5 mm wide and 11 mm thick and weighs 65 g without strap. Worn & Wound gives 45.7 mm lug to lug in 2014 and 46.5 mm in 2022.

    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.