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Seiko Sumo

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Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex Sumo All Black - Limited Edition 2020 - New -
R 14 626
Verified Dealer
6
IT
Seiko Prospex Steel 52,6mm Black No numerals
Seiko SBDC031 black SUMO Prospex 200M Diver
R 9 209
Free shipping
Verified Dealer
85
JP
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex Sumo SPB101J1 Cal 6R35 - Sapphire 70 Hours PR.
R 13 350
Verified Dealer
31
ES
Seiko Prospex Steel 44mm Green No numerals
Seiko Prospex Sumo Green SZSC004
R 13 723
Verified Dealer
1512
DE
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex Sumo SPB101J new unworn b&p
R 15 783
Verified Dealer
76
UK
Seiko Prospex Steel 45mm Green No numerals
Seiko Sumo Prospex Green Dial
R 12 936
Verified Dealer
23
AU
Seiko Prospex Steel 45mm Blue
Seiko Prospex
R 7 093
Private Seller
 
RO
Seiko Prospex Blue
Seiko Prospex Diver Scuba SBDC033 - SBDC033
R 9 525
Free shipping
Verified Dealer
2280
US
Seiko Prospex Steel Blue
Seiko PROSPEX Japan Exclusive "HULK SUMO" SZSC004
R 12 954
Verified Dealer
17
HK
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex - Sumo Black 45 mm - Automatic - New - SPB101J1 -
R 12 663
Verified Dealer
6
IT
Seiko Prospex Steel 52,6mm Blue
Seiko SBDC033 blue SUMO Prospex 200M Diver
R 8 371
Free shipping
Verified Dealer
85
JP
Seiko Prospex Steel 45mm Green No numerals
Seiko Prospex SBDC081 SPB103 Diver 200m SUMO JAPAN MADE ( NEW )
R 16 186
Free shipping
Verified Dealer
119
US
Seiko Prospex Black
Seiko Prospex Diver Scuba SBDC031 - SBDC031
R 14 317
Verified Dealer
765
JP
Seiko Prospex Steel 44mm Blue No numerals
Seiko Prospex SUMO
R 12 761
Verified Dealer
1533
ES
Seiko Prospex Steel
Seiko Prospex SBDC081 SBP103 Diver 200m 3rd SUMO
R 12 306
Verified Dealer
621
JP
Seiko Prospex Steel 44mm Black No numerals
Seiko SBDC001 Prospex First Gen Sumo Scuba Dial
R 8 552
Private Seller
 
US
Seiko Prospex Steel 45,00mm Blue No numerals
Seiko Prospex Sumo Blue Coral Sumo SBDC069
R 15 117
Verified Dealer
414
PL
Seiko Prospex Steel 52.6mm Green Arabic numerals
Seiko PROSPEX 2019 "NEW SUMO" Automatic Watch SPB103J1 Green
R 13 464
Verified Dealer
17
HK
Seiko Prospex Steel 45mm Green No numerals
Seiko Prospex Diver Sumo Green - HULK - Automatic - SPB103J1
R 13 252
Verified Dealer
6
IT
Seiko Steel 45mm Black No numerals
Seiko SBDC095/SPB125J1 Black SUMO Limited Edition
R 19 254
Free shipping
Verified Dealer
85
JP
Seiko Prospex
Seiko Prospex Sumo Green
R 13 152
Private Seller
 
UK
Seiko Prospex Steel Green No numerals
Seiko Prospex Prospex SZSC004 Green SUMO 200m Diver
R 15 286
Free shipping
Verified Dealer
119
US
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex "Sumo"
R 15 019
Verified Dealer
1533
ES
Seiko Prospex 15mm Black
Seiko Prospex SBDC095 / SPB125 BLACK SUMO 200m Diver Limited...
R 16 191
Private Seller
 
SG
Seiko Prospex Steel 45mm Blue
Seiko Prospex Automatic Diver 200M 45mm SBDC033J I
R 11 760
Verified Dealer
4455
IT
Seiko Prospex Steel 45mm Blue No numerals
Seiko Men's SBDC033J Prospex Sumo Blue Dial Watch
R 9 404
Verified Dealer
2309
DE
Seiko Prospex Steel 52.6mm Black No numerals
Seiko PROSPEX 2019 "NEW SUMO" Automatic Watch SPB101J1 BLACK
R 13 464
Verified Dealer
17
HK
Seiko Prospex Steel 45mm Black No numerals
Seiko Sumo SBDC031J1
R 12 192
Verified Dealer
414
PL
Seiko Prospex Steel 52,6mm Blue No numerals
Seiko SBDC057 Prospex PEPSI
R 9 209
Free shipping
Verified Dealer
85
JP
Seiko Prospex Steel 45mm
Seiko SBDC027 "Sumo" 50th Anniversary (RARE & LIMITED)
R 36 010
Verified Dealer
11
US
Seiko Prospex Steel Green No numerals
Seiko Prospex SZSC004 Green SUMO 200m Diver
R 10 967
Verified Dealer
621
JP
Seiko Prospex Steel 45mm Blue
Seiko Uomo SBDC033J Prospex Orologio
R 9 718
Verified Dealer
718
IT
Seiko Prospex Blue
Seiko Prospex Diver Scuba SBDC033 - SBDC033
R 9 419
Verified Dealer
765
JP
Seiko Prospex Steel 45mm Black
Seiko Prospex Automatic Air Diver Rare Limited Edition 2015 5531
R 33 356
Verified Dealer
4455
IT
Seiko Prospex Black
Seiko Prospex Diver Scuba SBDC031 - SBDC031
R 8 084
Free shipping
Verified Dealer
2280
US
Seiko Prospex Steel 45mm Purple No numerals
Seiko International Edition Prospex Zimbe Sumo Purple SPB055J1
R 72 002
Free shipping
Verified Dealer
132
SG
Seiko Prospex Steel 45mm Blue No numerals
Seiko Prospex SBDC033J1
R 12 192
Verified Dealer
414
PL
Seiko Prospex Steel 53mm Green No numerals
Seiko SZSC004 Green Emerald SUMO Prospex Special Edition
R 12 892
Free shipping
Verified Dealer
85
JP
Seiko Prospex Steel
Seiko Prospex JDM Sumo Green SZSC004 (New, Extremely Rare)
R 15 178
Verified Dealer
90
JP
Seiko Prospex Steel Blue
Seiko Prospex SBDC069 Blue Coral SUMO 200m Diver
R 10 468
Verified Dealer
621
JP
Seiko Prospex Steel 45mm Blue No numerals
Seiko PROSPEX SEA DIVER SCUBA SUMO SBDC033J
R 10 818
Verified Dealer
111
IT
Seiko Prospex Steel 45mm Green No numerals
Seiko Prospex Green Sumo Spb103j1 Men's Watch
R 13 162
Verified Dealer
SG
Seiko Prospex Steel 45mm Black No numerals
Seiko PROSPEX Automatic Diver 200 Steel Black Dial 45mm
R 10 405
Verified Dealer
3109
IT
Seiko Prospex
Seiko PROSPEX Sumo Green SPB103 SPB103J JAPAN Automatic Mens...
R 12 936
Verified Dealer
54
AU
Seiko Prospex Steel 45mm Blue No numerals
Seiko Japan Edition Prospex Sumo Automatic SBDC069
R 17 987
Free shipping
Verified Dealer
132
SG
Seiko Prospex Steel 45mm Blue No numerals
TOP
Seiko JDM JAPAN MADE Blumo Blue Sumo Diver's Watch SBDC033
R 9 903
Verified Dealer
65
PH
Seiko Prospex Steel 45mm Yellow No numerals
Seiko SBDC017 Yellow SUMO Prospex Limited Edition 750 pcs.
R 61 111
Free shipping
Verified Dealer
85
JP
Seiko Prospex Steel
Seiko Prospex Green Sumo SPB031J1 (NEW, Extremely Rare)
R 53 781
Verified Dealer
90
JP
Seiko Prospex Steel
Seiko Prospex SBDC083 Diver 200m 3rd SUMO
R 12 306
Verified Dealer
621
JP
Seiko Prospex Blue
Seiko Prospex Diver Scuba SBDC033 - SBDC033
R 10 444
Verified Dealer
182
HK
Seiko Prospex Steel 45mm Green No numerals
Seiko Japan Edition Prospex Sumo Automatic SZSC004
R 17 987
Free shipping
Verified Dealer
132
SG
Seiko Prospex Steel 45mm Blue No numerals
Seiko PROSPEX Automatic Diver 200 Steel Blue Dial 45mm
R 10 209
Verified Dealer
3109
IT
Seiko Prospex
Seiko Prospex Black Sunburst Dial Sumo SPB101 SPB101J JAPAN...
R 13 289
Verified Dealer
54
AU
Seiko Prospex Steel No numerals
Seiko International Edition Prospex Sumo Chronograph SSC759J1
R 16 186
Free shipping
Verified Dealer
132
SG
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex Limited Edition Black Series Sumo Mens Watch...
R 16 186
Verified Dealer
65
PH
Seiko Prospex Steel 53mm Blue No numerals
Seiko SBDC069 SUMO Blue Coral Reef Prospex Special Edition
R 10 129
Free shipping
Verified Dealer
85
JP
Seiko Prospex Steel
Seiko Prospex Zimbe Sumo SPB055J (NEW, 1639 Limited)
R 25 873
Verified Dealer
90
JP
Seiko Prospex Steel Black No numerals
Seiko International Edition Prospex Sumo Chronograph SSC761J1
R 17 987
Free shipping
Verified Dealer
132
SG
Seiko Prospex Black
Seiko Prospex Diver Scuba SBDC031 - SBDC031
R 16 016
Verified Dealer
182
HK
Seiko Prospex Steel 45mm Green No numerals
Seiko International Edition Prospex Sumo Automatic SPB103J1
R 19 787
Free shipping
Verified Dealer
132
SG
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Seiko Sumo: The Affordable Diving Watch for Pros

The Sumo is one of the most coveted and affordable diving watches made by Japanese manufacturer Seiko. This watch boasts high-quality workmanship, water resistance to 200 m, and a robust, automatic in-house movement.


Highlights

  • Professional diving watch
  • In-house movement 6R15 with a 50-hour power reserve
  • Waterproof to 200 m (20 bar)
  • Seiko Sumo with 45-mm diameter

Seiko Sumo – An Iconic Diving Watch

The Seiko Sumo is known among watch enthusiasts as a popular, high-quality, and nonetheless affordable diving watch. As its name suggests, this wristwatch is relatively large. The 45-mm case is indeed rather sizable, but overall the watch doesn't come across as particularly bulky as it is only 13 mm thick. The unidirectional bezel, useful for keeping track of dive time, is set into the case, which contributes to the watch's relative slimness. In addition to its size, the position of the crown at 4 o'clock is another distinguishing feature of the Seiko Sumo .

Within the Prospex collection – the collection name stems from "Professional Specifications" – the Seiko Sumo falls in the middle range of prices. It is a bit more expensive than the Turtle, but considerably less expensive than the Marinemaster. To the untrained eye, the Sumo differs only slightly from the Marinemaster 300. Thus it presents an affordable alternative to the more pricey professional diving watch.


How much does a Seiko Sumo cost?

Reference number Price (approx.) Limited run
SBDC049 1,000 euros 1,000 pieces
SBDC027 1,000 euros 2,000 pieces
SBDC001 600 euros
SBDC031 450 euros
SBDC033 450 euros

Detailed Price Information

Prices for the Seiko Sumo start around 450 euros for standard models with reference numbers SBDC031 and SBDC033. The Seiko PADI Ref. SBDC049 is limited to 1,000 pieces and is considerably more expensive at around 1,000 euros. In celebration of the 50th anniversary of its diving watches, Seiko released several other limited editions in 2015. Among these is the Sumo model with reference number SBDC027, which was limited to 2,000 pieces.

The 50th Anniversary Model of the Sumo was fitted with some upgrades, raising the quality above that of the standard models. For example, scratch-resistant sapphire glass gives wearers a clear look at the display in the upgraded model, whereas Seiko's Hardlexglas shields the display in the standard models. Additionally, the case of the SBDC027 is protected from small scratches by a Dia Shield coating . The design of the bezel is more reminiscent of the higher-end Marinemaster 300 than the other Sumo models. The shape of the hands and hour markers also differs. The Anniversary Model has indices instead of the large dots that typically mark the hours on Sumo models, and slimmer, rod-shaped hands replace the sword hands of the standard variants. The list price of the Sumo SBDC027 was around 1,000 euros at the time of its release in 2015. However, due to its limited run, this model is rather difficult to come by.


Design and Workmanship of the Seiko Sumo

The case of the Seiko Sumo is finished to a high standard and can easily hold its own among Swiss luxury watches. It is superbly polished and satin brushed. Even the in-house movement 6R15 is lightly finished, despite being hidden behind a large, screw-down case back. Thanks to this case back and the screw-down crown, the case is water resistant to 200 m (20 bar). The fluted crown is easy to use, as is the unidirectional diving bezel, which can only be turned counterclockwise for safety reasons.

The standard models SBDC031 and SBDC033 feature either black or blue dials and bezel inlays. The brand inscription is located under the 12 o'clock position, and over 6 o'clock there is a large X signifying the Prospex collection. Beneath the X, the words "Automatic" and "Diver's 200m" are written. The date display is situated at 3 o'clock. The three hands, the hour markers, and the zero marker of the rotating bezel are all coated with glowing LumiBrite luminescent material . Lumibrite ensures that the time can be read easily in the dark or underwater and is said to glow longer and more brightly than other comparable materials.

The lug for the bracelet is 20 mm wide and thus appears rather slim on this large diving watch. The stainless steel bracelet is well made and has a fold-over buckle with a security clasp and brackets. However, the bracelet is still not quite up to the overall high standard of workmanship of the Seiko Sumo. Luckily it can easily be replaced with a NATO or silicon strap, for example. The latter cost around 50 euros.

Features of the Seiko Sumo

  • Case and bracelet made of stainless steel
  • 45-mm diameter, 13-mm thickness
  • Polished and satin-brushed case
  • Screw-down case back and crown
  • Scratch-resistant Hardlex glass
  • Bright LumiBrite luminescent material
  • Models in black or blue

Equipped with an In-House Movement

The Japanese in-house movement 6R15 ticks away inside of the Seiko Sumo. It consists of 168 individual parts and 23 jewels. The power reserve lasts 50 hours and thus surpasses the frequently-used Swiss ETA caliber 2824 by 10 hours. The 6R15 has a date display, can be wound by hand, and has a stop-seconds mechanism allowing the time to be set to the exact second. The deviation is a generous -15 to +25 seconds a day according to Seiko, meaning that it does not run as accurately as Swiss chronometers, which typically have an average daily deviation of -4 to +6 seconds. On the wrist, however, many Seiko watches are very precise and deviate only a few seconds a day.