A Review of the Seiko Sumo: Heavyweight in the Dive Watches Arena - The Watch Company
Seiko Prospex Sumo Ninja Black Serie PVD SPB125J1 / SBDC095
SEIKO SPB103J1 SUMO HULK Full Review | SBDC081 Seiko Sumo in Green | 6R35 - YouTube
My Eastern Watch Collection: Seiko Prospex Green Sumo SPB103J1 (similar to SPB101J1) - Continuing the Tradition with Further Improvement Possible, A Review (plus Video)
Hands-on Review - SPB103 vs. SBDC031 vs. SBDC001 - chrono-addict