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Seiko Sumo


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Seiko Prospex Steel 45mm United States of America, New Jersey, Rahway
Seiko SBDC027 "Sumo" 50th Anniversary (RARE & LIMITED)
$2,000
Professional dealer
22
US
Seiko Prospex Steel Blue United States of America, North Carolina, Charlotte
Seiko Prospex
$397
Private Seller
 
US
Seiko Prospex Steel Blue United States of America, Florida, Boca Raton
Seiko Prospex SPB179 Sumo Arctic Blue Ice Diver USA Exclusive...
$795
Professional dealer
104
US
Seiko Prospex Steel 45mm Black No numerals United States of America, Florida
Seiko SBDC001
$600
Professional dealer
212
US
Seiko Prospex Steel 45mm Black United States of America, California, Burlingame
Seiko Prospex Sumo Black Series Limited Edition Watch 45MM -...
$899
Free shipping
Professional dealer
4642
US
Seiko Prospex Steel 44mm Black United States of America, Florida, Pompano Beach
Seiko Scuba Sumo SBDC001 Rare Pre-Prospex No X Dial Auto MM300...
$995
Professional dealer
231
US
Seiko Prospex Steel Black United States of America, Ohio, USA
Seiko NEW SUMO PROSPEX SBDC083 SPB101 DIVER 200M JAPAN MADE (NEW)
$898
Free shipping
Professional dealer
273
US
Seiko Prospex Steel Green
Seiko (セイコー) 精工 Seiko Prospex SBDC081 SBP103 Diver 200m 3rd SUMO
$690
Professional dealer
86
JP
Seiko Prospex Steel 43,5mm Green No numerals
Seiko Prospex Ref. SZSC004 Green SUMO 200m Diver
$1,097
Free shipping
Professional dealer
508
PT
Seiko Prospex Steel 45mm Green No numerals
Seiko Prospex45mm Automatic Diver's 200M Date, Green Sumo,...
$792
Professional dealer
275
IT
Seiko Prospex Steel
Seiko Prospex JDM Sumo Green SZSC004 (New, Extremely Rare)
$1,087
Professional dealer
119
JP
Seiko Steel Black No numerals
Seiko Sumo limitierte black edition
$717
Private Seller
 
DE
Seiko Prospex Black
Seiko Prospex Diver Scuba SBDC031 - SBDC031
$947
Professional dealer
1060
DK
Seiko Prospex Steel 44.50mm United States of America, California, Burlingame
Seiko PROSPEX SEA SOLAR DIVERS BLACK SERIES LIMITED EDITION...
$719
Free shipping
Professional dealer
4642
US
Seiko Prospex Steel 45mm Black
Seiko Prospex Sumo Black Series Limited Edition Watch 45MM -...
$830
Professional dealer
2064
JP
Seiko Prospex Steel 45mm Black No numerals United States of America, Ohio, USA
Seiko Prospex Sumo Black Series Limited Edition SPB125J1 JAPAN...
$1,499
Free shipping
Professional dealer
273
US
Seiko Prospex
Seiko (セイコー) Seiko Prospex Sumo Scuba Gray Japan Limited...
$848
Professional dealer
86
JP
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex Diver´s Sumo Ref. SPB101J1EST
$1,170
Free shipping
Professional dealer
508
PT
Seiko Prospex Steel 45mmmm Black No numerals
Seiko Prospex TURTLE New Sumo SUB Automatic Black Dial 45mm...
$756
Professional dealer
4146
IT
Seiko Prospex Steel
Seiko Prospex PADI Collaboration SBDC049 (NEW, 1,000 Limited)
$1,387
Professional dealer
119
JP
Seiko Prospex Steel 45mm
Seiko Prospex Blue Sumo SBDC033
$486
Private Seller
 
GR
Seiko Prospex Steel 45mm Black
Seiko Prospex Sumo Black Series Limited Edition Watch 45MM -...
$998
Professional dealer
1060
DK
Seiko Prospex Black United States of America, California, San Mateo
Seiko Prospex Diver Scuba SBDC031 - SBDC031
$779
Free shipping
Professional dealer
4642
US
Seiko Prospex Steel 44.50mm
Seiko PROSPEX SEA SOLAR DIVERS BLACK SERIES LIMITED EDITION...
$680
Professional dealer
2064
JP
Seiko Prospex Steel 45mm Green No numerals United States of America, New Hampshire, USA
Seiko Prospex SBDC081 SPB103 Diver 200m SUMO JAPAN MADE ( NEW )
$822
Free shipping
Professional dealer
273
US
Seiko Prospex Steel Black No numerals
Seiko (セイコー) Seiko Prospex Diver Scuba SBDC031 - SBDC031
$451
Professional dealer
86
JP
Seiko Prospex Steel 45mm Black No numerals
Seiko International Limited Edition Prospex Sumo Automatic...
$1,219
Free shipping
Professional dealer
46
PT
Seiko Prospex Steel
Seiko Prospex SBDC081 SBP103 Diver 200m 3rd SUMO
$645
Professional dealer
2790
JP
Seiko Prospex Steel 45mm Black
Seiko Prospex Automatic Air Diver Rare Limited Edition 2015 5531
$1,876
Free shipping
Professional dealer
5767
IT
Seiko Prospex Steel 44.5mm Black
Seiko Prospex Sumo
$547
Private Seller
 
DE
Seiko Prospex
Seiko PROSPEX Sumo PADI Special Edition Divers Watch - SPB181J1
$913
Professional dealer
1060
DK
Seiko Prospex United States of America, California, Burlingame
Seiko PROSPEX Sumo PADI Special Edition Divers Watch - SPB181J1
$759
Free shipping
Professional dealer
4642
US
Seiko Prospex Steel 45mm Blue
Seiko Prospex
$548
Private Seller
 
BE
Seiko 45mm
Seiko Sumo Emeral Limited Edition for the Japanese Domestic...
$701
Private Seller
 
ES
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex
$618
Private Seller
 
HR
Seiko Prospex Steel 45mm Orange No numerals
Seiko HOMENAJE SUMO SBDC005
$719
Private Seller
 
ES
Seiko Prospex Steel 45mm Black No numerals
Seiko SBDC027 Limited Edition
$1,433
Private Seller
 
HU
Seiko Prospex Steel Green No numerals United States of America, Ohio, USA
Seiko Prospex Prospex SZSC004 Green SUMO 200m Diver
$1,038
Free shipping
Professional dealer
273
US
Seiko Prospex Steel Black
Seiko (セイコー) Seiko Prospex SBDC083 SPB101J Diver 200m 3rd SUMO
$567
Professional dealer
86
JP
Seiko Prospex Steel 45mm Black No numerals
Seiko Sumo SBDC001 Black - No X dial
$590
Private Seller
 
DK
Seiko Blue
Seiko Sumo sbdc069
$640
Private Seller
 
FR
Seiko Prospex
Seiko PROSPEX Sumo PADI Special Edition Divers Watch - SPB181J1
$724
Professional dealer
2064
JP
Seiko Prospex Steel 45mm Blue
Seiko Sumo SBDC003
$751
Private Seller
 
HU
Seiko Prospex Steel
Seiko Sumo
$488
Private Seller
 
HR
Seiko Prospex Steel 43.5mm Black
Seiko Prospex Black Series 'Ninja Sumo' SNE493P1
$859
Private Seller
 
UK
Seiko Prospex Steel
Seiko Sumo SBDC019
$3,915
Private Seller
 
AE
Seiko Prospex Steel Blue No numerals
Seiko Prospex Blue Coral Sumo SBDC069
$945
Private Seller
 
AT
Seiko Prospex
Seiko (セイコー) Sumo SBDC095 SPB125 Black NINJA Automatic JAPAN...
$859
Professional dealer
86
JP
Seiko Prospex Steel 45mm Blue
Seiko Sumo PADI Prospex SBDC057 Full Set
$603
Private Seller
 
ES
Seiko Prospex 45mm
Seiko Prospex Sumo
$670
Private Seller
 
DE
Seiko Prospex Steel 44.50mm
Seiko PROSPEX SEA SOLAR DIVERS BLACK SERIES LIMITED EDITION...
$803
Professional dealer
1060
DK
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex 3rd Gen Sumo Black SBDC083 SPB101J1 Diver's 200M...
$817
Private Seller
 
HR
Seiko Prospex Steel 44mm Black
Seiko Sumo 50th Anniversary SBDC027
$2,147
Private Seller
 
UK
Seiko Prospex Steel 45mm Blue No numerals
Seiko Prospex Blue Sumo
$580
Private Seller
 
UK
Seiko Prospex Steel Green
Seiko 精工 Seiko Prospex SBDC081 SBP103 Diver 200m 3rd SUMO
$795
Professional dealer
185
JP
Seiko Prospex Steel 45mm Brown No numerals
Seiko Prospex
$791
Private Seller
 
HK
Seiko Prospex Steel
Seiko Prospex Green Sumo SBDC019 (NEW, 550 Pcs, Extremely Rare)
$3,987
Professional dealer
119
JP
Seiko Prospex Steel Black
Seiko Prospex Limited Édition black séries "Ninja Sumo"
$865
Private Seller
 
BE
Seiko Prospex
Seiko Zimbe Sumo prospex SPB055J Thanos
$1,828
Private Seller
 
BE
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex Padi Sumo Diver/B+P/03-2021
$730
Professional dealer
1025
DE
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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.