Review of the Seiko Sumo SBDC001 | Book & Quote Monster
Sumo for small wrist? | WatchUSeek Watch Forums
My Eastern Watch Collection: Seiko Prospex Green Sumo SPB103J1 (similar to SPB101J1) - Continuing the Tradition with Further Improvement Possible, A Review (plus Video)
Sumo on 6.5/6.75" wrist (brief review and a few pictures) | WatchUSeek Watch Forums
SPB101 Sumo] just sharing this wrist shot with other Seiko fans here : r/ Seiko
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)