Seiko SBDC001 Sumo wrist watch. Case design. Part 1

This was a present for my father. I reviewed over 10 different models, and settled on the Seiko SBDC001 44mm with a black dial. The original strap is a steel bracelet. I am featuring it here with a rubber strap. The Sumo, nicknamed by the fans on popular Seiko forums, was released way back in 2007 as part of the Prospex line, which stands for Professional specification. In this video I describe the design of the watch case. The Sumo doesn't have a crown guard - thank goodness. Instead the crown is positioned our of harms way at 4 o'clock. The bezel is concealed in profile. It has two different surface finishes to give the case depth. Specs: More accurate than the entry level 7s-caliber divers Longer power reserve (50 hours) Solid feel, high quality stainless steel Immaculately polished finish Very good value for the money Specifications: Black DialStainless Steel Case and BandDouble Locking Fold-over Push-button Clasp with Divers ExtensionUnidirectional Rotating BezelCurved Hardlex CrystalScrew Down CrownScrew Back Case6R15 CaliberAutomatic with Manual Winding Crown23 Jewels~50 Hour Power ReserveAccuracy of +25 to -15 Seconds per DayWater Resistant to 200mResistant to Magnetic InterferenceSecond Hand Stop FunctionLumiBrite on Hands and MarkersCase Size (HxWxD): 50 x 48 x 13.3mmCase Diameter: 44mmBand Width: 20mmWeight: 183g Specifications: Caliber: 6R15B 23 jewels Caseback type: 6R15-00G0 Movement: Automatic, plus auxiliary hand winding and hacking Beat rate: 21,600 bph (6 beats/sec) Loss/gain: Less than 25sec/day Power reserve: 50 hours Calendar: Date onlyCrown: Screw-in type Construction: Stainless steel Crystal: Hardlex glass, slightly domed profile Bezel: Unidirectional, 120 graduations Rating: 200m, ISO certified Luminous material: LumiBrite™Movement Japan, cased in Japan