Sumo] [Lamdmaster] There is 1.5mm difference in diameter between these two watches - and the Sumo is bigger lug to lug. The lack of bezel makes the Landmaster look huge. : r/Seiko
The Old SZSC004 & New SPB103J1 Seiko Green "Hulk" Sumo | WatchinTyme
Smaller-sized Sumo? | WatchUSeek Watch Forums
20mm Crafter Blue - Navy Blue Rubber Curved Lug Watch Band compatible with Seiko Sumo SBDC001, SBDC031 & SPB101 | Watch bands, Seiko sumo, Replacement watch bands