Tutorial
How to measure your watch lug width
Learn how to measure the gap between your watch lugs with simple tools so you can buy a replacement strap that fits on your first attempt.
· 3 min read
Seiko Prospex Diver 1970 Mystic Lagoon
Seiko · Prospex Divers
Ref. SPB288
- Case diameter
- 42.7 mm
- Case height
- 13.2 mm
- Case material
- Stainless Steel
- Case shape
- Round
- Water resistance
- 200 m
- Caliber
- 6R35
- Dial
- Blue
The Seiko Prospex Diver 1970 Mystic Lagoon takes a 20 mm strap: measure between the lugs and that is the only number you need. We list 1,170 straps in that width. Built for water, it wears naturally on rubber or a nylon NATO; a leather strap keeps it for dry days. With a 42.7 mm case and 200 m of water resistance, a thicker strap balances the case. Most straps here come with quick-release spring bars, so the swap takes a minute and no tool.
We do not sell watches. This page exists to find the straps that fit this one.