Seiko MM300 SBDX001 Curved End Hexad Watch Bands | Strapcode
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
Prospex Marinemaster Island Green SLA047 / SLA047J1 Limited 140th
Seiko Marinemaster against the Seiko Sumo - YouTube
Please Compare: Seiko Sumo vs Baby MM | WatchUSeek Watch Forums
Proxima MM300: An Seiko Marinemaster 300 for 1/15 the price : r/ChineseWatches
Seiko Sumo SBDC083 vs Seiko mm300 SBDX023/SLA021 - YouTube