Prospex PADI “Great Blue” 200M Sumo Ref. SBDC189

The nickname Sumo was initially not the official name of this Prospex series of watches. Yet somehow the name stuck and is now acknowledged by Seiko itself. The name’s origins could be explained by some theories. The first theory is that of the robust, oversized countenance of the watch together with a thin 20mm bracelet. The second explanation lies in how the 12 o’clock marker looks like a Mawashi, the underwear donned by Japanese sumo wrestlers during a match. The third explanation lies in how the bezel’s shape is akin to the Dohyo or ring where Sumo takes place.

Seiko Prospex PADI “Great Blue” 200M Sumo Ref. SBDC189

Next, the connection between Seiko and PADI (which stands for Professional Association of Diving Instructors), the world’s most trusted scuba diving training organization, also merits attention. Established in 1966 and based in the US, PADI offers an array of courses ranging from entry-level to relatively advanced recreational diver certification courses. This association is reported to have awarded over 27 million scuba certifications, in over 6,300 diving centers globally. 2016 marked the beginning of the partnership between PADI and Seiko via the first special edition, the ever reliable PADI Turtle SRPA21J1. Other editions with novel designs and updated materials have since surfaced. Today we introduce the Seiko Prospex PADI 200m “Great Blue” Sumo Ref. SBDC189.

This edition of the Seiko Sumo Prospex Diver alludes very much to the original concept of 2007. The bulky case with a small lug width of 20mm measures a 45mm diameter and boasts a height of 12.9mm. Furthermore, it has a lug-to-lug measurement of 52.6mm. The twisted lugs, the curved profile and the succession of large polished surfaces with thin brushed lines in-between adds to the appeal of this dive watch. Moreover, the 4 o’clock crown, a sturdy bezel that outlines its unique dial, huge lugs and a circular shape retain the design of this latest Sumo almost like its predecessors. 

New Seiko Calibre 6R35 With 70 Hours Power Reserve

The difference between this watch and earlier Sumo watches, however, is in the quality of the materials used. 2018 saw the introduction of a sapphire crystal with an inner anti-reflective coating for excellent readability.

The bezel also boasts a ceramic insert with a revamped 60-minute scale, now done in the “Great Turtle” blue hue, with a lighter turquoise blue for the first  20 minutes markings. The Sumo SBDC189 now comes with an appealing  cleaning blue dial reminiscent of the graduating blue colour of the ocean, with wave patterns found on the top half of the dial, reminding one of the surface of the sea. Lastly, the Sumo clads a two-tone handset, where the minute is done in matching light blue which befits its overall theme.

Iconic Sumo Case Design

The trademark markers and hands that have been featured as part of the watch design since 2007 remain. The distinctive “Sumo Belt” index at 12 o’clock is still intact with the shape of the handset. Lumibrite generously coats all the watch elements, with a small luminous marker next to an unframed date window.

The movement remains the same as before with a 3Hz and 70-hour automatic calibre 6R35. The redesigned 3-link bracelet is now entirely brushed and showcases a novel, robust folding clasp with secure lock, push-button release and wetsuit extension. If you are looking to expand your watch collection, then this watch is certainly worth considering.

Seiko's LumiBrite

All in all, for more than a decade, the Sumo is still one of the best bangs for buck Seiko dive watch. Some might complain about the price increase from its predecessor, but we beg to differ — the Seiko Prospex PADI 200M “Great Blue” Sumo Ref. SBDC189 is one hell of a watch that has been the first in its class to have a brand new movement with an enormous amount of power reserve.  While it stays true to its formidable durability and legibility, with a proven design that started its cult following, featuring excellent casework, and unique dial layout.