Seiko · Prospex
Marinemaster
Ref. SBDX001 — “MM300”
discontinuedFirst MM300DocumentedLast reviewed Not yet reviewed
Reference photography not yet on file
The MM300. A monocoque case, so there is no caseback to unscrew for a movement inspection — a practical constraint on examination that should be planned for rather than discovered.
At a glance
- Brand
- Seiko
- Collection
- Prospex
- Reference
- SBDX001
- Production
- 2000–2015
- Caliber
- 8L35
- Case diameter
- 44.3mm
- Case material
- Stainless steel
Related references
Reference family timeline
Every generation in this lineage in production order. Spans are as documented; an open end means the reference is current or its end year is not established.
- 2000–2015This reference
- 2015–2020