Tutorial 6 min read
Omega Speedmaster watch strap guide
One black dial, four different directions. Explore suede, nylon, rubber and woven straps, starting with the 20 mm lugs of a specific Moonwatch reference.
Seiko · Prospex Divers
Prospex Divers Marinemaster 300 Ninja Tuna
Ref. SBBN035
Watch details and strap advice
- Case diameter
- 47.7 mm
- Case height
- 14.7 mm
- Case material
- Stainless Steel
- Case shape
- Round
- Water resistance
- 300 m
- Caliber
- 7C46
- Dial
- Black
The Seiko Prospex Divers Marinemaster 300 Ninja Tuna takes a 21 mm strap: measure between the lugs and that is the only number you need. We list 6 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 47.7 mm case and 300 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.
Straps by lug width (21 mm) 6
All 6 21 mm strapsWidth is a starting point. Check the case and end fittings before choosing.
-
Deployant RubberRubber€49.90 -
Sailcloth WeaveNylon€27.90 -
Suede RallyLeather€34.90 -
Classic EmbossedLeather€24.90 -
Epsom GrainLeather€27.90 -
Heritage SuedeLeather€29.90
Read before you choose
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Tutorial 3 min read
Choosing a NATO strap or a two-piece strap
Learn how NATO and two-piece straps attach to your watch, affect wrist height, and provide security so you can choose the right style.
Tutorial 6 min read
How to change a watch strap
Identify the attachment, release the correct part and check that both tips are seated. Illustrated instructions for quick-release bars, conventional bars and nylon pass-through straps.