Yet another Seiko SBDC003 / SBDC 033 review – Small Toys for Grown Men
FS : Seiko 1st gen blue SUMO(Blumo) sbdc003 $250 | The Watch Site
FS: Seiko SBDC003 "Blumo" no "X" full set, $425 | The Watch Site
Seiko Prospex SBDC003 first generation Blue Sumo Scuba Diver Watch | eBay
Seiko Sumo SBDC 003 aka Blumo - YouTube
Seiko Prospex Scuba SBDC003 Blue Sumo - Shopping In Japan NET
WTS] The Ultimate Blue-mo! - A Seiko "Sumo" ref. SBDC003 with Sapphire, Ceramic, Automatic 6R Movement, OEM Bracelet, and Full Box and Papers, Just $399 Shipped! : r/Watchexchange