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Seiko Sumo

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Seiko Steel 44mm Green No numerals United States of America, New Jersey, Hoboken
Seiko Sumo Green SZSC004
$600
Private Seller
 
US
Seiko Prospex Black United States of America, California, San Mateo
Seiko Prospex Diver Scuba SBDC031 - SBDC031
$809
Free shipping
Verified Dealer
3200
US
Seiko Prospex Steel 45mm Green No numerals United States of America, Iowa, USA
Seiko Prospex SBDC081 SPB103 Diver 200m SUMO JAPAN MADE ( NEW )
$899
Free shipping
Verified Dealer
175
US
Seiko Steel 44mm Silver United States of America, Texas
Seiko Pre-Owned Seiko Silver Sumo LE SPB029
$1,750
Verified Dealer
83
US
Seiko Prospex
Seiko SPB101J1 Prospex Sumo Black
$896
Verified Dealer
6
SG
Seiko Prospex Steel
Seiko Prospex JDM Sumo Green SZSC004 (New, Extremely Rare)
$843
Verified Dealer
99
JP
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex Black Sumo Limited Edition Ref. SPB125J1
$1,185
Free shipping
Verified Dealer
405
PT
Seiko Prospex Steel
Seiko Prospex SBDC081 SBP103 Diver 200m 3rd SUMO
$716
Verified Dealer
1317
JP
Seiko Prospex Steel 45mm United States of America, New Jersey, Rahway
Seiko SBDC027 "Sumo" 50th Anniversary (RARE & LIMITED)
$2,000
Verified Dealer
15
US
Seiko Steel Green No numerals
Seiko Sumo Szsc004 Green Emerald Edizione Speciale Numerata...
$845
Private Seller
 
IT
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex Sumo SPB101J1 Cal 6R35 - Sapphire 70 Hours PR.
$822
Verified Dealer
316
ES
Seiko Prospex Steel Black United States of America, Ohio, USA
Seiko NEW SUMO PROSPEX SBDC083 SPB101 DIVER 200M JAPAN MADE (NEW)
$799
Free shipping
Verified Dealer
175
US
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex Diver´s Sumo SPB101J1EST
$1,082
Verified Dealer
40
ES
Seiko Prospex Steel 45mm Green No numerals
Seiko Prospex Divers Automatic Scuba "Sumo"
$720
Private Seller
 
DE
Seiko Prospex Steel
Seiko Prospex PADI Collaboration SBDC049 (NEW, 1,000 Limited)
$1,297
Verified Dealer
99
JP
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex Diver´s Sumo Ref. SPB101J1EST
$1,161
Free shipping
Verified Dealer
405
PT
Seiko Prospex Steel 52,6mm Blue
Seiko SBDC033 blue SUMO Prospex 200M Diver
$487
Free shipping
Verified Dealer
259
JP
Seiko Prospex Steel 44mm Blue No numerals
Seiko Sumo First Generation
$593
Private Seller
 
BE
Seiko Prospex Steel 44mm Champagne No numerals
Seiko SBDC027 | Limited Edition | 50th anniversary | Sumo
$1,572
Private Seller
 
NL
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex Sumo Black - Limited Edition 2020 - New -
$889
Verified Dealer
122
IT
Seiko Prospex
Seiko Prospex 200M Automatic Black Sumo Sapphire 3rd Gen Ref....
$710
Private Seller
 
SG
Seiko Prospex Steel Green No numerals United States of America, Ohio, USA
Seiko Prospex Prospex SZSC004 Green SUMO 200m Diver
$899
Free shipping
Verified Dealer
175
US
Seiko Prospex Steel 44mm Blue No numerals
Seiko SUMO - SBDC069 (Japan Domestic Market)
$786
Private Seller
 
FR
Seiko Prospex Steel
Seiko Prospex Green Sumo SPB031J1 (NEW, Extremely Rare)
$2,987
Verified Dealer
99
JP
Seiko Prospex Steel 43,5mm Green No numerals
Seiko Prospex Ref. SZSC004 Green SUMO 200m Diver
$1,088
Free shipping
Verified Dealer
405
PT
Seiko Steel 52mm Green No numerals
Seiko SZSC004 Green Sumo
$955
Private Seller
 
AT
Seiko Prospex Steel 45mm
Seiko Prospex Silver Sumo Limited Edition SPB029J1
$2,600
Private Seller
 
HU
Seiko Prospex Steel 52,6mm Black No numerals
Seiko SBDC031 black SUMO Prospex 200M Diver
$536
Free shipping
Verified Dealer
259
JP
Seiko Prospex Steel White
Seiko Prospex USA Exclusive Ice Diver Sumo
$1,790
Private Seller
 
AE
Seiko Prospex Steel 44mm Green
Seiko SPB031J1 Prospex Green Sumo Lim. Ed.
$2,201
Private Seller
 
IT
Seiko Prospex Steel 45mm Green No numerals
Seiko Prospex Diver Sumo Green - HULK - Automatic - SPB103J1
$773
Verified Dealer
122
IT
Seiko Prospex Steel 44mm
Seiko Scuba sumo
$1,149
Private Seller
 
FR
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex
$1,293
Private Seller
 
PL
Seiko Prospex Steel
Seiko Prospex Green Sumo SBDC019 (NEW, 550 Pcs, Extremely Rare)
$3,987
Verified Dealer
99
JP
Seiko Prospex Steel 45mm Blue
Seiko Prospex
$600
Private Seller
 
UK
Seiko Prospex Steel Blue
Seiko Prospex SBDC069 Blue Coral SUMO 200m Diver
$570
Verified Dealer
1317
JP
Seiko Prospex Steel Black
Seiko Prospex
$1,209
Private Seller
 
GR
Seiko Prospex Steel 53mm Green No numerals
Seiko SZSC004 Green Emerald SUMO Prospex Special Edition
$750
Free shipping
Verified Dealer
259
JP
Seiko Prospex Black
Seiko Prospex Diver Scuba SBDC031 - SBDC031
$1,017
Verified Dealer
201
DK
Seiko Prospex Steel 45mm Black No numerals
Seiko Limited Edition Prospex Sumo Black Series
$931
Verified Dealer
1690
ES
Seiko Prospex Steel 52.6mm Black No numerals
Seiko AUGUST Promotion Sale Seiko PROSPEX 2019 "NEW SUMO"...
$674
Verified Dealer
139
HK
Seiko Prospex Steel 45mm Green No numerals
Seiko Prospex SPB103J1 Automatic Green 'New Sumo' Diver
$743
Free shipping
Verified Dealer
1493
NL
Seiko Prospex Steel
Seiko Prospex Zimbe Sumo SPB055J (NEW, 1639 Limited)
$1,437
Verified Dealer
99
JP
Seiko Prospex Steel 45mm Green No numerals
Seiko Green Sumo Prospex
$692
Verified Dealer
356
SG
Seiko Prospex Steel Green No numerals
Seiko Prospex SZSC004 Green SUMO 200m Diver
$706
Verified Dealer
1317
JP
Seiko Prospex Steel Black
Seiko Prospex Diver's Sumo Solar Chrono
$665
Verified Dealer
57
ES
Seiko Prospex Steel 53mm Blue No numerals
Seiko SBDC069 SUMO Blue Coral Reef Prospex Special Edition
$638
Free shipping
Verified Dealer
259
JP
Seiko Prospex Steel 45mm Green No numerals
Seiko Sumo Prospex Green Dial
$848
Verified Dealer
61
AU
Seiko Prospex Steel 44mm Black No numerals
Seiko Prospex Solar Sumo Limited Edition
$768
Verified Dealer
1690
ES
Seiko Prospex Steel 52.6mm Blue No numerals
Seiko PROSPEX 2020 Japan Exclusive "DEEP BLUE SUMO" SBDC099
$971
Verified Dealer
139
HK
Seiko Prospex Black
Seiko Prospex Diver Scuba SBDC031 - SBDC031
$833
Verified Dealer
1008
JP
Seiko Prospex Steel 43mm Black Arabic numerals
Seiko Prospex Diver Scuba SBDC069 (NEW, Rare Watch)
$748
Verified Dealer
99
JP
Seiko Prospex Steel 45mm
Seiko Black Sumo Prospex
$733
Verified Dealer
356
SG
Seiko Prospex Steel
Seiko Prospex SBDC083 Diver 200m 3rd SUMO
$716
Verified Dealer
1317
JP
Seiko Prospex Steel 44.5mm Blue No numerals
Seiko Prospex Diver's Sumo Solar Chrono
$629
Verified Dealer
57
ES
Seiko Prospex Steel 45mm Yellow No numerals
Seiko SBDC017 Yellow SUMO Prospex Limited Edition 750 pcs.
$3,555
Free shipping
Verified Dealer
259
JP
Seiko Prospex Steel 42mm Black No numerals
Seiko 3rd Sumo Prospex Watch SBDC081 with 1 year warranty (tax...
$665
Verified Dealer
34
HK
Seiko Prospex Steel 44.5mm Blue No numerals
Seiko Prospex Solar Diver's Sumo
$689
Verified Dealer
1690
ES
Seiko Prospex Steel 52.6mm Blue No numerals
Seiko AUGUST Promotion Sale Seiko PROSPEX 2020 Japan Exclusive...
$860
Verified Dealer
139
HK
Seiko Prospex Steel 45mm Black No numerals
Seiko Sumo Sbdc031j1
$751
Verified Dealer
530
PL
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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.


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