Doxa SUB 300

    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

    Listed by the maker for ref. 821.10.241.10, 821.10.241.25 and 29 more

    42 to 42.5 mm cases · 2025

    Find your exact reference

    Official page: Doxa

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

    Collection38 references
    20 mm
    Illustration drawn to scale: 42.5 mm case, 20 mm lugs

    Lug widths across the line

    The Doxa SUB 300 takes a 20 mm strap: all 38 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

    38 Doxa SUB 300 references

    Doxa SUB 300 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.

    • 821.10.241.10

      SUB 300 Aquamarine

      20 mm

      Maker

      42 mmAquamarine dialSteel

      Attachment
      classic lugs
      Style
      diver
      Movement
      Automatic
      Caseback
      Sapphire back
      Production
      2020, present
      Status
      Listed by the maker

    • 821.10.241.25

      SUB 300 Aquamarine (Rubber)

      20 mm

      Maker

      42.5 mmOrange dialStainless steel

      Attachment
      classic lugs
      Status
      Listed by the maker

    • 821.10.011

      SUB 300 Beta 2025

      20 mm

      Database

      42 mm2025Aquamarine dialSteel

      Attachment
      classic lugs
      Style
      diver
      Movement
      Automatic
      Caseback
      Solid back
      Production
      2025-present
      Status
      Listed in our database, not yet verified

    • 821.10.351L

      SUB 300 Black Lung Limited

      20 mm

      Database

      42 mmOrange/Black Lung dialSteel

      Attachment
      classic lugs
      Style
      diver
      Movement
      Automatic
      Caseback
      Sapphire back
      Production
      2019-2019
      Status
      Listed in our database, not yet verified

    • 822.70.351L

      SUB 300 Carbon Black Lung

      20 mm

      Database

      42 mmOrange/Black Lung dialCarbon

      Attachment
      classic lugs
      Style
      diver
      Movement
      Automatic
      Caseback
      Sapphire back
      Production
      2022-2022
      Status
      Listed in our database, not yet verified

    • 822.70.201C

      SUB 300 Carbon COSC Blue

      20 mm

      Database

      42 mmBlue dialCarbon

      Attachment
      classic lugs
      Style
      diver
      Movement
      Automatic COSC
      Caseback
      Sapphire back
      Production
      2023, present
      Status
      Listed in our database, not yet verified

    • 822.70.351C

      SUB 300 Carbon COSC Orange

      20 mm

      Database

      42 mmOrange dialCarbon

      Attachment
      classic lugs
      Style
      diver
      Movement
      Automatic COSC
      Caseback
      Sapphire back
      Production
      2023, present
      Status
      Listed in our database, not yet verified

    • 822.70.351.21

      SUB 300 Carbon Professional

      20 mm

      Maker

      42 mmOrange dialCarbon

      Attachment
      classic lugs
      Style
      diver
      Movement
      Automatic
      Caseback
      Sapphire back
      Production
      2021, present
      Status
      Listed by the maker

    • 821.10.201.32

      SUB 300 Caribbean (Rubber)

      20 mm

      Maker

      42.5 mmOrange dialStainless steel

      Attachment
      classic lugs
      Status
      Listed by the maker

    • 821.10.201.10

      SUB 300 Caribbean Blue

      20 mm

      Maker

      42 mmBlue dialSteel

      Attachment
      classic lugs
      Style
      diver
      Movement
      Automatic
      Caseback
      Sapphire back
      Production
      2020, present
      Status
      Listed by the maker

    • 821.10.361.31

      SUB 300 Divingstar (Rubber)

      20 mm

      Maker

      42.5 mmOrange dialStainless steel

      Attachment
      classic lugs
      Status
      Listed by the maker

    • 821.10.361.10

      SUB 300 Divingstar Yellow

      20 mm

      Maker

      42 mmYellow dialSteel

      Attachment
      classic lugs
      Style
      diver
      Movement
      Automatic
      Caseback
      Sapphire back
      Production
      2020, present
      Status
      Listed by the maker

    • 821.10.351.21

      SUB 300 Professional (Rubber)

      20 mm

      Maker

      42.5 mmOrange dialStainless steel

      Attachment
      classic lugs
      Status
      Listed by the maker

    • 821.10.351C

      SUB 300 Professional COSC

      20 mm

      Database

      42 mmOrange dialSteel

      Attachment
      classic lugs
      Style
      diver
      Movement
      Automatic COSC
      Caseback
      Sapphire back
      Production
      2021, present
      Status
      Listed in our database, not yet verified

    • 821.10.351.10

      SUB 300 Professional Orange

      20 mm

      Maker

      42 mmOrange dialSteel

      Attachment
      classic lugs
      Style
      diver
      Movement
      Automatic
      Caseback
      Sapphire back
      Production
      2020, present
      Status
      Listed by the maker

    • 821.10.131.10

      SUB 300 Sea Emerald (Stainless Steel)

      20 mm

      Maker

      42.5 mmOrange dialStainless steel

      Attachment
      classic lugs
      Status
      Listed by the maker

    • 821.10.131.26‑N

      SUB 300 Sea Emerald NATO

      20 mm

      Maker

      42.5 mmGreen dial316L stainless steel

      Attachment
      NATO strap, quick release spring bars
      Style
      diver
      Movement
      Manual Chronograph
      Caseback
      Screw steel
      Production
      1976-1980
      Status
      Listed by the maker

    • 821.10.021C

      SUB 300 Searambler COSC

      20 mm

      Database

      42 mmSilver dialSteel

      Attachment
      classic lugs
      Style
      diver
      Movement
      Automatic COSC
      Caseback
      Sapphire back
      Production
      2021, present
      Status
      Listed in our database, not yet verified

    • 821.10.021.10

      SUB 300 Searambler Silver

      20 mm

      Maker

      42 mmSilver dialSteel

      Attachment
      classic lugs
      Style
      diver
      Movement
      Automatic
      Caseback
      Sapphire back
      Production
      2020, present
      Status
      Listed by the maker

    • 821.10.101.10

      SUB 300 Sharkhunter Black

      20 mm

      Maker

      42 mmBlack dialSteel

      Attachment
      classic lugs
      Style
      diver
      Movement
      Automatic
      Caseback
      Sapphire back
      Production
      2020, present
      Status
      Listed by the maker

    • 821.10.101.20

      SUB 300 Sharkhunter Rubber

      20 mm

      Maker

      42.5 mmBlack dial316L stainless steel

      Style
      diver
      Movement
      Manual Chronograph
      Caseback
      Screw steel
      Production
      1976-1980
      Status
      Listed by the maker

    • 821.10.021.20

      SUB 300 Whitepearl

      20 mm

      Maker

      42 mmWhite dialSteel

      Attachment
      classic lugs
      Style
      diver
      Movement
      Automatic
      Caseback
      Sapphire back
      Production
      2020, present
      Status
      Listed by the maker

    • 821.10.011.23

      SUB 300 Whitepearl (Rubber)

      20 mm

      Maker

      42.5 mmOrange dialStainless steel

      Attachment
      classic lugs
      Status
      Listed by the maker

    • 821.10.011.10

      SUB 300 Whitepearl (Stainless Steel)

      20 mm

      Maker

      42.5 mmOrange dialStainless steel

      Attachment
      classic lugs
      Status
      Listed by the maker

    • 830.10.241.20

      SUB 300β Aquamarine (Rubber Black)

      20 mm

      Maker

      42.5 mmTurquoise dialStainless steel

      Attachment
      classic lugs
      Style
      diver
      Status
      Listed by the maker

    • 830.10.241.25

      SUB 300β Aquamarine (Rubber Turquoise)

      20 mm

      Maker

      42.5 mmTurquoise dialStainless steel

      Attachment
      classic lugs
      Style
      diver
      Status
      Listed by the maker

    • 830.10.241.10

      SUB 300β Aquamarine (Stainless steel)

      20 mm

      Maker

      42.5 mmTurquoise dialStainless steel

      Attachment
      classic lugs
      Style
      diver
      Status
      Listed by the maker

    • 830.10.201.32

      SUB 300β Caribbean (Rubber Navy blue)

      20 mm

      Maker

      42.5 mmNavy dialStainless steel

      Attachment
      classic lugs
      Style
      diver
      Status
      Listed by the maker

    • 830.10.201.23

      SUB 300β Caribbean (Rubber White)

      20 mm

      Maker

      42.5 mmNavy dialStainless steel

      Attachment
      classic lugs
      Style
      diver
      Status
      Listed by the maker

    • 830.10.361.20

      SUB 300β Divingstar (Rubber Black)

      20 mm

      Maker

      42.5 mmYellow dialStainless steel

      Attachment
      classic lugs
      Style
      diver
      Status
      Listed by the maker

    • 830.10.361.31

      SUB 300β Divingstar (Rubber Yellow)

      20 mm

      Maker

      42.5 mmYellow dialStainless steel

      Attachment
      classic lugs
      Style
      diver
      Status
      Listed by the maker

    • 830.10.361.10

      SUB 300β Divingstar (Stainless steel)

      20 mm

      Maker

      42.5 mmYellow dialStainless steel

      Attachment
      classic lugs
      Style
      diver
      Status
      Listed by the maker

    • 830.10.351.20

      SUB 300β Professional (Rubber Black)

      20 mm

      Maker

      42.5 mmOrange dialStainless steel

      Attachment
      classic lugs
      Style
      diver
      Status
      Listed by the maker

    • 830.10.351.21

      SUB 300β Professional (Rubber Orange)

      20 mm

      Maker

      42.5 mmOrange dialStainless steel

      Attachment
      classic lugs
      Style
      diver
      Status
      Listed by the maker

    • 830.10.351.10

      SUB 300β Professional (Stainless steel)

      20 mm

      Maker

      42.5 mmOrange dialStainless steel

      Attachment
      classic lugs
      Style
      diver
      Status
      Listed by the maker

    • 830.10.021.20

      SUB 300β Searambler (Rubber Black)

      20 mm

      Maker

      42.5 mmSilver dialStainless steel

      Attachment
      classic lugs
      Style
      diver
      Status
      Listed by the maker

    • 830.10.021.23

      SUB 300β Searambler (Rubber White)

      20 mm

      Maker

      42.5 mmSilver dialStainless steel

      Attachment
      classic lugs
      Style
      diver
      Status
      Listed by the maker

    • 830.10.021.10

      SUB 300β Searambler (Stainless steel)

      20 mm

      Maker

      42.5 mmSilver dialStainless steel

      Attachment
      classic lugs
      Style
      diver
      Status
      Listed by the maker

    FAQ

    What lug width does the Doxa SUB 300 use?

    The Doxa SUB 300 takes a 20 mm strap: all 38 references with a listed width in our database use 20 mm. Check the reference on your case back to be sure. The Doxa SUB 300 ref. 821.10.241.10, 821.10.241.25 and 29 more take 20 mm (listed by the maker).

    Where do these Doxa SUB 300 lug widths come from?

    From our database, which lists 38 Doxa SUB 300 references, 38 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 Doxa collections

    All Doxa 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.