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Seiko Sumo

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Seiko Prospex Steel Black
Seiko Prospex Scuba "Sumo"
R 7 011
Private Seller
 
FR
Seiko Prospex Steel 45mm Blue
Seiko Prospex
R 7 253
Private Seller
 
RO
Seiko Prospex Steel
Seiko Prospex SBDC081 SBP103 Diver 200m 3rd SUMO
R 12 442
Verified Dealer
486
JP
Seiko Prospex Steel 52.6mm Green Arabic numerals
Seiko PROSPEX 2019 "NEW SUMO" Automatic Watch SPB103J1 Green
R 13 788
Verified Dealer
5
HK
Seiko Prospex Blue
Seiko Prospex Diver Scuba SBDC033 - SBDC033
R 9 751
Free shipping
Verified Dealer
2051
US
Seiko Prospex Steel 45mm Blue No numerals
Seiko Prospex Sumo Pepsi
R 9 014
Private Seller
 
FR
Seiko Prospex Steel 44mm Black No numerals
Seiko SBDC001 Prospex First Gen Sumo Scuba Dial
R 8 756
Private Seller
 
US
Seiko Prospex Steel 44mm Green No numerals
Seiko Green Sumo Limited Edition (365 of 550)
R 35 944
Private Seller
 
US
Seiko Prospex Steel 52,6mm Black No numerals
Seiko SBDC031 black SUMO Prospex 200M Diver
R 9 310
Free shipping
Verified Dealer
54
JP
Seiko Prospex Steel
Seiko Prospex JDM Sumo Green SZSC004 (New, Extremely Rare)
R 15 539
Verified Dealer
88
JP
Seiko Steel 45mm Green No numerals
Seiko JDM Seiko Sumo Emerald Green Hulk SZSC004 -NEW-Limited...
R 18 008
Private Seller
 
ES
Seiko Prospex 15mm Black
Seiko Prospex SBDC095 / SPB125 BLACK SUMO 200m Diver Limited...
R 16 564
Private Seller
 
SG
Seiko Prospex Steel 52.6mm Black No numerals
Seiko PROSPEX 2019 "NEW SUMO" Automatic Watch SPB101J1 BLACK
R 13 788
Verified Dealer
5
HK
Seiko Prospex Steel 45mm Black
Seiko Prospex Automatic Air Diver Rare Limited Edition 2015 5531
R 34 033
Verified Dealer
4347
IT
Seiko Prospex Steel 45mm Green No numerals
Seiko Sumo Prospex Green Dial
R 13 780
Verified Dealer
7
AU
Seiko Prospex Steel 45mm Green No numerals
Seiko Prospex SBDC081 SPB103 Diver 200m SUMO JAPAN MADE ( NEW )
R 15 447
Free shipping
Verified Dealer
97
US
Seiko Prospex Steel 45mm Blue No numerals
Seiko Men's SBDC033J Prospex Sumo Blue Dial Watch
R 9 595
Verified Dealer
2109
DE
Seiko Prospex Steel 53mm Green No numerals
Seiko SZSC004 Green Emerald SUMO Prospex Special Edition
R 12 696
Free shipping
Verified Dealer
54
JP
Seiko Prospex Steel 53mm Blue No numerals
Seiko Prospex SUMO SBDC069 with 1 year warranty
R 10 436
Verified Dealer
 
HK
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex Sumo SPB101J new unworn b&p
R 16 470
Verified Dealer
69
UK
Seiko Prospex Steel Black Arabic numerals
Seiko Prospex Sumo
R 7 612
Private Seller
 
DE
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex Sumo - Scuba
R 14 002
Verified Dealer
577
DE
Seiko Prospex Steel 45mm Blue
Seiko Prospex Automatic Diver 200M 45mm SBDC033J I
R 11 999
Verified Dealer
4347
IT
Seiko Prospex Blue
Seiko Prospex Diver Scuba SBDC033 - SBDC033
R 9 431
Verified Dealer
709
JP
Seiko Prospex Steel Blue
Seiko Prospex SBDC069 Blue Coral SUMO 200m Diver
R 10 583
Verified Dealer
486
JP
Seiko Prospex Steel 44mm Black
Seiko Sumo Automatik Prospex Diver´s 200m mit Saphirglas
R 11 818
Verified Dealer
129
AT
Seiko Steel 45mm Black No numerals
Seiko SBDC095/SPB125J1 Black SUMO Limited Edition
R 19 467
Free shipping
Verified Dealer
54
JP
Seiko Prospex Steel Green No numerals
Seiko Prospex Prospex SZSC004 Green SUMO 200m Diver
R 13 235
Free shipping
Verified Dealer
97
US
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex "Sumo"
R 15 324
Verified Dealer
1493
ES
Seiko Prospex Steel
Seiko Prospex Green Sumo SPB031J1 (NEW, Extremely Rare)
R 55 059
Verified Dealer
88
JP
Seiko Prospex Steel 45,00mm Blue No numerals
Seiko Prospex Sumo Blue Coral Sumo SBDC069
R 15 379
Verified Dealer
379
PL
Seiko Prospex Steel 45mm Green No numerals
Seiko Prospex Divers Sumo
R 13 801
Verified Dealer
48
ES
Seiko Prospex Steel 45mm Blue
Seiko Uomo SBDC033J Prospex Orologio
R 9 915
Verified Dealer
651
IT
Seiko Prospex Steel Green No numerals
Seiko Prospex SZSC004 Green SUMO 200m Diver
R 11 088
Verified Dealer
486
JP
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex Black Series Limited Edition (SUMO) - SPB125J1
R 16 668
Private Seller
 
SG
Seiko Prospex Steel 52,6mm Blue
Seiko SBDC033 blue SUMO Prospex 200M Diver
R 8 464
Free shipping
Verified Dealer
54
JP
Seiko Prospex Steel 45mm Blue No numerals
Seiko JDM JAPAN MADE Blumo Blue Sumo Diver's Watch SBDC033
R 10 138
Verified Dealer
61
PH
Seiko Prospex Steel 44mm Blue No numerals
Seiko Prospex SUMO
R 13 020
Verified Dealer
1493
ES
Seiko Prospex Steel
Seiko Prospex Zimbe Sumo SPB055J (NEW, 1639 Limited)
R 26 488
Verified Dealer
88
JP
Seiko Prospex Steel 45mm Blue No numerals
Seiko Prospex SBDC033J1
R 12 439
Verified Dealer
379
PL
Seiko Prospex Steel
Seiko Prospex Divers Sumo
R 15 324
Verified Dealer
48
ES
Seiko Prospex Steel 45mm Green No numerals
Seiko Prospex Green Sumo Spb103j1 Men's Watch
R 13 474
Verified Dealer
SG
Seiko Prospex Steel
Seiko Prospex SBDC083 Diver 200m 3rd SUMO
R 12 442
Verified Dealer
486
JP
Seiko Prospex Black
Seiko Prospex Diver Scuba SBDC031 - SBDC031
R 8 276
Free shipping
Verified Dealer
2051
US
Seiko Prospex Steel 53mm Blue No numerals
Seiko SBDC069 SUMO Blue Coral Reef Prospex Special Edition
R 10 242
Free shipping
Verified Dealer
54
JP
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex Limited Edition Black Series Sumo Mens Watch...
R 16 571
Verified Dealer
61
PH
Seiko Prospex Steel 45mm Black No numerals
Seiko PROSPEX Automatic Diver 200 Steel Black Dial 45mm
R 10 416
Verified Dealer
2877
IT
Seiko Prospex Steel 43mm Black Arabic numerals
Seiko Prospex Diver Scuba SBDC069 (NEW, Rare Watch)
R 13 788
Verified Dealer
88
JP
Seiko Prospex Steel 45mm Black No numerals
Seiko Sumo SBDC031J1
R 12 439
Verified Dealer
379
PL
Seiko Prospex Steel
Seiko PROSPEX DIVERS SUMO AUTOMATIC
R 14 623
Verified Dealer
48
ES
Seiko Prospex Steel 45mm Green No numerals
Seiko International Edition Prospex Sumo Automatic SPB103J1
R 20 258
Free shipping
Verified Dealer
118
SG
Seiko Prospex Steel 45mm Black
Seiko Prospex Automatic Diver 200 45 mm SBDC031J I
R 11 197
Verified Dealer
4347
IT
Seiko Prospex Blue
Seiko Prospex Diver Scuba SBDC033 - SBDC033
R 10 458
Verified Dealer
179
HK
Seiko Prospex Steel 45mm Yellow No numerals
Seiko SBDC017 Yellow SUMO Prospex Limited Edition 750 pcs.
R 61 788
Free shipping
Verified Dealer
54
JP
Seiko Prospex Black
Seiko Prospex Diver Scuba SBDC031 - SBDC031
R 14 336
Verified Dealer
709
JP
Seiko Prospex Steel 45mm Blue No numerals
Seiko PROSPEX Automatic Diver 200 Steel Blue Dial 45mm
R 10 416
Verified Dealer
2877
IT
Seiko Prospex Steel
Seiko Prospex Silver Sumo Men Watch SPB029 (NEW, 1965 Limited)
R 32 884
Verified Dealer
88
JP
Seiko Steel 44,5mm Black
Seiko SUMO CHRONO SOLAR BLACK LIMITED EDITION
R 11 818
Verified Dealer
191
IT
Seiko Prospex Steel
Seiko PROSPEX DIVER´S SUMO
R 11 918
Verified Dealer
48
ES
Seiko Prospex Steel 45mm Black No numerals
Seiko International Edition Prospex Sumo Automatic SPB125J1
R 22 101
Free shipping
Verified Dealer
118
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.