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    Seiko Prospex lug width

    Watch line179 references

    Lug widths across the line

    20 mm is the most common lug width on the Seiko Prospex: 87 of the 168 references with a known width (52%). Other references use 22 mm, 19 mm, 21 mm, so check your exact reference.

    Filter references by lug width

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

    Seiko Prospex strap size through the years

    1. 202640 mm case20 mmlug widthHBC011J1
    2. 202139 mm case20 mmlug widthSSC813
    3. 202042.7 mm case20 mmlug widthSPB151, SPB153
    4. 202040.5 mm case20 mmlug widthSPB143, SPB143J1, SPB147, SPB453
    5. 201945 mm case20 mmlug widthSPB101, SPB103
    6. 201944.8 mm case22 mmlug widthSBDB021, SBDB025
    7. 201743.8 mm case22 mmlug widthSRPB49, SRPB51, SRPC93
    8. 201743 mm case20 mmlug widthSNE435
    9. 201645 mm case22 mmlug widthSRP773, SRP777, SRPA21, SRPC91New strap size
    10. 201442 mm case20 mmlug widthSSC009

    First year each case and lug width combination appears in the line, newest first.

    179 Seiko Prospex references

    The story of the Seiko Prospex

    Worn by

    Japanese Antarctic Research Expedition membersService

    Members of the Japanese Antarctic Research Expedition used the original 1965 Seiko diver, the ancestor of this line, from 1966 to 1969.

    Generations and strap changes

    1. 2020
      1965 Modern Re-interpretation

      SPB143J1 and SPB147J1 reinterpreted the 1965 diver in a 40.0 mm case with the 6R35 calibre and 70-hour reserve.

      SPB143J1 ships on a three-link steel bracelet with folding clasp and extension.

    2. 2019
      Re-Creation SLA033

      A limited Prospex tribute to the 1965 diver with the 8L35 movement and 200M rating.

      Delivered on a waffle-pattern silicone strap.

    3. 1986
      1000M 7C46-7008

      A professional diver water resistant to 1000M.

    4. 1978
      Quartz 600M 7549-7009

      The first saturation diver powered by a quartz movement.

    5. 1975
      Professional 600M 6159-7010

      A saturation diver rated to 600M with a titanium outer case.

    6. 1968
      6105 diver

      The 150M 6105 was introduced and stayed in production for the following decade.

    7. 1965
      150M Diver 62MAS

      Seiko's first Japanese dive watch, rated to 150M, was worn on the 8th Japanese Antarctic Research Expedition.

    Firsts and innovations

    Seiko states that the 1965 model was Japan's first diver's watch.

    About Seiko

    Founded in 1881 in Tokyo, Japan.

    The Seiko story

    FAQ

    What lug width does the Seiko Prospex use?

    Most references use 20 mm (52% of the 168 references with a known width). Some use 22 mm or 19 mm.

    Do all Seiko Prospex references take the same strap?

    No. 6 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.

    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.