SBDX017 & SBDC031] my MM300 and my Poor Man's MM300. Modded a Sumo into a PMMM some 5 years ago and later replaced it with a real one when I could afford
Some Call It A Baby Marine Master 200 & Some Call It A Sumo! Meet Seik| Strapcode
Reliving the Golden Age of the Professional Diver: The Baby M.M. "Redu – Gnomon Watches
Seiko Marine Master Vs Sumo | 腕時計, 時計
Seiko Sumo vs...Omega Seamaster? Sure, let's do it - YouTube
Seiko Monster to Sumo to Marine Master - Overview of Seiko Divers - YouTube
Seiko Baby Marinemaster & Sumo! - YouTube
The Seiko Watches That Our Fratello Editors Love — Marinemaster, Sumo, Pogue, And More
My Eastern Watch Collection: Seiko Prospex JDM Baby Marinemaster 200 Meter Diver SBDC061 (similar to SBDC063 or SPB077/SPB079) - Similar to a Seiko Sumo, A Review (plus Video)
ROLEX SUBMARINER VS SEIKO MM300 - YouTube
Sumo vs. MM300 | WatchUSeek Watch Forums
Seiko Marinemaster against the Seiko Sumo - YouTube
Seiko: Sumo or save up for a Marine Master? | Omega Forums
The Seiko Watches That Our Fratello Editors Love — Marinemaster, Sumo, Pogue, And More
Seiko Blumo vs Seiko Baby MarineMaster SBDC061 vs SBDC033 Which is the better dive watch? - YouTube
Two For Tuesday: Seiko Marinemaster 300 Vs. Baby Marinemaster
Seiko Sumo vs Seiko Turtle - Which to buy? - YouTube
Reliving the Golden Age of the Professional Diver: The Baby M.M. "Redu – Gnomon Watches