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    Omega Seamaster lug width

    Watch line45 references

    Lug widths across the line

    Omega Seamaster references use 18 mm or 20 mm or 21 mm depending on the reference and case size, so check yours in the list below. The most common is 21 mm (11 of 41 references with a known width).

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

    45 Omega Seamaster references

    FAQ

    What lug width does the Omega Seamaster use?

    Omega Seamaster references use 18 mm or 20 mm or 21 mm depending on the reference and case size, so check yours in the list below. The most common is 21 mm (11 of 41 references with a known width).

    Do all Omega Seamaster references take the same strap?

    No. 5 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.

    What is the lug width of the current Seamaster Diver 300M?

    The 42 mm Diver 300M ref. 210.30.42.20.03.001 measures 20 mm between the lugs, with a 49.90 mm lug-to-lug, on Omega's own spec sheet.

    Did the 2018 Diver 300M change size?

    Yes. The case went from 41 mm to 42 mm to fit the in-house calibre 8800, and the date moved from 3 to 6 o'clock.

    What strap width does the modern Seamaster 300 take?

    The 41 mm Seamaster 300 of 2023 measures 21 mm between the lugs, an odd size worth checking before buying a strap.

    What size strap fits the Seamaster 1948 reissue?

    Omega lists 19 mm between the lugs for both 38 mm Seamaster 1948 limited editions, small seconds and central seconds.

    What strap goes on a military Seamaster 300 ref. 165.024?

    The British military 165.024 cases were delivered with fixed spring bars, so a strap has to pass under the bars. Phillips catalogued such watches on nylon and NATO straps.

    What clasp comes on the Diver 300M bracelet?

    A foldover clasp with a comfort setting and a diver extension.

    The story of the Omega Seamaster

    Omega launched the Seamaster in 1948 for its centenary as a watch for town, sea and country, built on what it learned making water-resistant watches for the Royal Air Force. Since GoldenEye in 1995, James Bond has worn a Seamaster in every 007 film.

    1948launch year, chosen to mark Omega's centenary
    GBP 157,250paid for Daniel Craig's titanium Skyfall Planet Ocean at Christie's in 2012
    15,000 gaussmagnetic resistance of calibre 8800 in the current Diver 300M
    14versions of the Diver 300M launched at once for its 25th anniversary in 2018

    Chapters

    1. 2018 to today
      Master Chronometer and 75 years

      For its 25th anniversary in 2018 the Diver 300M grew from 41 mm to 42 mm, took a ceramic wave dial and the Master Chronometer calibre 8800, and moved its date to 6 o'clock. The same year Omega reissued the 1948 Seamaster in 1,948 pieces, and in 2023 it marked 75 years with 11 Summer Blue references.

    2. 2002 to 2017
      Aqua Terra, Planet Ocean, Co-Axial

      The family widened with the Aqua Terra of 2002 and the Planet Ocean of 2005, the latter carrying George Daniels' Co-Axial escapement in calibre 2500. Omega also reissued the Seamaster 1948 for the 2012 London Olympics and brought back a modern Seamaster 300 inspired by the 1957 original.

    3. 1993 to 2004
      Wave dial and a naval commander

      The Seamaster Diver 300M arrived in 1993, and its chronograph, with a wavy dial, was named Watch of the Year 1994 by Armbanduhren. In 1995 costume designer Lindy Hemming chose a blue Diver 300M for James Bond in GoldenEye, reasoning that it was the most appropriate watch for a naval Commander.

    4. 1957 to 1969
      The Seamaster 300 goes under

      In 1957 the Seamaster 300 joined the Speedmaster and Railmaster in Omega's professional trilogy, its water resistance signalled by a Naiad star on the crown. Cousteau's team relied on it during Precontinent II in the Red Sea in 1963, and from 1967 Omega built a small batch with fixed bars for the British Royal Navy and Army.

    5. 1948 to 1956
      A centenary watch for town

      The first Seamasters of 1948 were modelled on the utilitarian watches Omega supplied to the British Ministry of Defence. Their key feature was an O-ring gasket that took water resistance to 60 metres, but they were sold as elegant watches for active people rather than dive instruments.

    6. 1932 to 1947
      The Marine and the war

      Omega's diving story starts with the Marine of 1932, sold as the first watch for civilian divers and tested to 73 metres in Lake Geneva in 1936. During the Second World War Omega supplied most of the water-resistant watches worn by Royal Air Force pilots and navigators.

    Worn by

    Pierce BrosnanScreen1995

    As Bond in GoldenEye he wore the quartz Seamaster Professional 300M ref. 2541.80, chosen by costume designer Lindy Hemming, then the automatic ref. 2531.80 in Tomorrow Never Dies. The Bond link has stayed unbroken since.

    Daniel CraigScreen2006

    In Casino Royale he alternated between a Diver 300M ref. 2220.80 and a Planet Ocean ref. 2900.50.91, then wore Planet Ocean models in Quantum of Solace and Skyfall, a titanium one made specially for Skyfall's action scenes.

    Prince WilliamHistory2023

    He has worn a midsize quartz Seamaster Diver 300M with a blue wave-patterned dial for over 20 years; it was a gift from his mother, Princess Diana, before her death in 1997. He wore it alongside a Garmin on his other wrist in 2023 and at Royal Ascot in 2025.

    Moments

    At Christie's 50 Years of James Bond auction in London in October 2012, the titanium Planet Ocean Daniel Craig wore in Skyfall sold for GBP 157,250 (about USD 254,273) against a USD 9,000 to 10,000 estimate, with proceeds to the charity ORBIS.

    At the Phillips Racing Pulse sale, a circa 1970 Seamaster 300 ref. ST 165.024 made for the British Royal Navy, with fixed spring bars and military markings, sold for USD 258,300 against an estimate of USD 30,000 to 60,000.

    In summer 1963 Cousteau's team used the Seamaster 300 in the Red Sea while proving divers could live in a saturated gas environment for long periods.

    For GoldenEye in 1995, costume designer Lindy Hemming chose a Seamaster because she judged it right for a naval commander, drawing on Omega's military heritage.

    Generations and strap changes

    1. 2023
      Ref. 234.30.41.21.03.002

      The 75th anniversary Summer Blue Seamaster 300: 41 mm steel, 13.9 mm thick, 48 mm long, calibre 8912 with 60 hours of reserve.

      21 mm between the lugs per Fratello.

    2. 2018
      Ref. 210.30.42.20.03.001

      The Master Chronometer Diver 300M: 42 mm steel, blue ceramic dial with laser-engraved waves, calibre 8800, 13.56 mm thick and 49.90 mm lug to lug.

      20 mm between lugs per Omega; the case grew from 41 mm to 42 mm in 2018. Steel bracelet with foldover clasp, comfort setting and diver extension.

    3. 2005
      Planet Ocean

      Took many design cues from the Seamaster 300 and carried George Daniels' Co-Axial escapement in calibre 2500.

    4. 1993
      Diver 300M refs. 2531.80 and 2541.80

      The Seamaster Professional Diver 300M launched as the automatic 2531.80 and the quartz 2541.80, both later worn by Pierce Brosnan's Bond. The movements were ETA 2892-A2 based.

    5. 1979
      Seamaster 200 SHOM

      Named by collectors after France's Marine Hydrographic and Oceanographic Service (SHOM), which selected it for its work producing official maps and charts for divers at sea.

    6. 1967
      Ref. ST 165.024 military

      A small batch of the Seamaster 300, calibre 552, built for the British Ministry of Defence from 1967 to about 1970, with screw-down crowns, tritium T dials and military engravings: 0552 for the Navy, W10 for the Army.

      Military cases were delivered with fixed spring bars, so these watches take pass-through straps; Phillips catalogued them on nylon and NATO straps.

    7. 1957
      Seamaster 300

      Omega's first dedicated Seamaster dive watch, launched with the Speedmaster and Railmaster. Its Naiad crown, marked with a star, signalled the water resistance.

    8. 1948
      First Seamaster

      Launched in Omega's centenary year with an O-ring gasket rated to 60 metres and marketed for town, sea and country. Christie's notes standard and chronometer self-winding versions.

    About Omega

    Founded in 1848 in La Chaux-de-Fonds, Switzerland.

    Ambassadors include Eddie Redmayne, Kaia Gerber, Presley Gerber The Omega story

    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.