HBF001J1
Prospex Marinemaster 1968 Heritage Diver's Watch
Lug width: 20 mm
Source: DatabaseCase size: 42.6 mmYear: 2026Black dialCase material: Stainless steel, ceramic bezel
- Attachment
- classic lugs
- Status
- Listed in our database, not yet verified
Seiko Prospex Marinemaster
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
Verification: From our database, not yet verified
42.6 to 44.3 mm cases · 2026
Indicative information. Check your watch before buying a strap: whatsmylugwidth.com is not responsible for an incorrect size.
Collection5 references
Lug widths across the line
The Seiko Prospex Marinemaster takes a 20 mm strap: all 5 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
5 Seiko Prospex Marinemaster references
Case size
Seiko Prospex Marinemaster 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.
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HBF002J1
Prospex Marinemaster 1968 Heritage JAMSTEC Limited Edition
Lug width: 20 mm
Source: DatabaseCase size: 42.6 mmYear: 2026White to blue gradient dialCase material: Stainless steel, ceramic bezel
- Attachment
- classic lugs
- Status
- Listed in our database, not yet verified
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SBDX021
Prospex Marinemaster
Lug width: 20 mm
Source: DatabaseCase size: 44.3 mm
- Attachment
- classic lugs
- Status
- Listed in our database, not yet verified
-
SLA019J1
Prospex Marinemaster
Lug width: 20 mm
Source: DatabaseCase size: 44.3 mmGreen dialCase material: Stainless steel
- Attachment
- classic lugs
- Status
- Listed in our database, not yet verified
-
SLA027J1
Prospex Marinemaster
Lug width: 20 mm
Source: DatabaseCase size: 44.3 mm
- Attachment
- classic lugs
- Status
- Listed in our database, not yet verified
No reference matches.
FAQ
What lug width does the Seiko Prospex Marinemaster use?
The Seiko Prospex Marinemaster takes a 20 mm strap: all 5 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 Seiko Prospex Marinemaster lug widths come from?
From our database, which lists 5 Seiko Prospex Marinemaster references, 5 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 Seiko collections
- Gunmetal17 to 22 mm
- Presage Cocktail Time Honeycomb20 mm
- Prospex Alpinist19 or 20 mm
- Prospex Antarctica Tuna Save The Ocean20 mm
- Prospex Land19 to 21 mm
- Prospex Save The Ocean22 mm
- Prospex Solar21 or 22 mm
- Prospex Speedtimer20 or 21 mm
- Samurai20 or 22 mm
- Seiko6 to 24 mm
- Seiko Selection4 to 22 mm
- Velatura22 mm
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
- Take the strap off, or look at the back of it: many straps print their width.
- Measure the inside gap between the lugs with a caliper or a millimetre ruler.
- 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.