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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
Verified Dealer
12
US
Seiko Prospex Blue United States of America, California, Burlingame
Seiko Prospex Diver Scuba SBDC033 - SBDC033
$559
Free shipping
Verified Dealer
2548
US
Seiko Prospex Steel 45mm Green No numerals
TOP
Seiko Green Sumo Prospex
$672
Verified Dealer
181
SG
Seiko Prospex Steel 45mm Black No numerals United States of America, California, El Segundo
Seiko Prospex SUMO
$695
Private Seller
 
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
145
US
Seiko Prospex Steel 45mm Purple No numerals
TOP
Seiko International Edition Prospex Zimbe Sumo Purple SPB055J1
$3,999
Free shipping
Verified Dealer
150
SG
Seiko Prospex Steel
Seiko Prospex JDM Sumo Green SZSC004 (New, Extremely Rare)
$843
Verified Dealer
93
JP
Seiko Prospex Steel 52,6mm Black No numerals
Seiko SBDC031 black SUMO Prospex 200M Diver
$522
Free shipping
Verified Dealer
136
JP
Seiko Prospex Steel 45mm Green No numerals
Seiko Prospex SPB103J1 - Sumo - Hulk
$794
Verified Dealer
222
PL
Seiko Prospex Steel 44mm Blue No numerals
Seiko Prospex SUMO
$743
Verified Dealer
1582
ES
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex Sumo SPB101J1 Cal 6R35 - Sapphire 70 Hours PR.
$777
Verified Dealer
93
ES
Seiko Prospex Steel 45mm Black
Seiko Prospex Automatic Air Diver Rare Limited Edition 2015 5531
$1,941
Verified Dealer
4573
IT
Seiko Prospex Steel 45mm Blue
Seiko Prospex Sumo
$457
Private Seller
 
IT
Seiko Prospex United States of America, Ohio, USA
Seiko NEW SUMO PROSPEX SBDC083 SPB101 DIVER 200M JAPAN MADE (NEW)
$799
Free shipping
Verified Dealer
145
US
Seiko Prospex Steel
Seiko Prospex SBDC081 SBP103 Diver 200m 3rd SUMO
$698
Verified Dealer
807
JP
Seiko Prospex Steel 45mm Green No numerals
Seiko Prospex Diver Sumo Green - HULK - Automatic - SPB103J1
$783
Verified Dealer
30
IT
Seiko Prospex Steel 53mm Green No numerals
Seiko SZSC004 Green Emerald SUMO Prospex Special Edition
$731
Free shipping
Verified Dealer
136
JP
Seiko Prospex Blue
Seiko Prospex Diver Scuba SBDC033 - SBDC033
$562
Verified Dealer
834
JP
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex "Sumo"
$874
Verified Dealer
1582
ES
Seiko Prospex Steel 45mm Green No numerals
Seiko Sumo Prospex Green Dial
$765
Verified Dealer
32
AU
Seiko Prospex Steel Black No numerals
Seiko Prospex limited edition black sumo
$971
Private Seller
 
DE
Seiko Prospex Steel 45mm Blue
Seiko Prospex Automatic Diver 200M 45mm SBDC033J I
$684
Verified Dealer
4573
IT
Seiko Prospex Steel Black
Seiko Prospex
$1,142
Private Seller
 
GR
Seiko Prospex
Seiko Prospex 200M Automatic Black Sumo Sapphire 3rd Gen Ref....
$691
Private Seller
 
SG
Seiko Prospex Steel 44mm
Seiko Scuba sumo
$1,200
Private Seller
 
FR
Seiko Prospex Steel 52,6mm Blue No numerals
Seiko SBDC057 Prospex PEPSI
$522
Free shipping
Verified Dealer
136
JP
Seiko Prospex
Seiko Prospex 200M Automatic Green Sumo Sapphire 3rd Gen Ref....
$715
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
145
US
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex - Sumo Black 45 mm - Automatic - New - SPB101J1 -
$753
Verified Dealer
30
IT
Seiko Prospex
Seiko prospex SBDC057 professional Spex mechanical watch
$427
Verified Dealer
807
JP
Seiko Prospex Black United States of America, California, San Mateo
Seiko Prospex Diver Scuba SBDC031 - SBDC031
$449
Free shipping
Verified Dealer
2548
US
Seiko Prospex Steel 45mm
Seiko Black Sumo Prospex
$713
Verified Dealer
181
SG
Seiko Prospex Steel 52.6mm Grey No numerals
Seiko PROSPEX 2020 Japan Exclusive "GREY SUMO DIVER" SBDC097
$971
Verified Dealer
48
HK
Seiko Prospex Steel 45mm Blue No numerals
Seiko Prospex SBDC033J1
$709
Verified Dealer
444
PL
Seiko Steel 45mm Black No numerals
Seiko SBDC095 Black SUMO Limited Edition
$1,092
Free shipping
Verified Dealer
136
JP
Seiko Prospex Steel 45mm Green No numerals
Seiko Prospex Green Sumo Spb103j1 Men's Watch
$650
Verified Dealer
269
SG
Seiko Prospex Steel 45mm Black
Seiko PROSPEX DIVER'S SUMO AUTOMATICO
$849
Verified Dealer
 
ES
Seiko Prospex Steel 45mm No numerals
Seiko Japan Edition Prospex Sumo Automatic SBDC019
$5,999
Verified Dealer
150
SG
Seiko Prospex Steel
Seiko Prospex Sumo Scuba Gray Japan Limited SBDC097 Watch
$888
Verified Dealer
807
JP
Seiko Prospex Steel
Seiko Prospex PADI Collaboration SBDC049 (NEW, 1,000 Limited)
$1,297
Verified Dealer
93
JP
Seiko Prospex Steel Blue
Seiko Prospex
$555
Verified Dealer
181
SG
Seiko Prospex Steel Blue
Seiko PROSPEX Japan Exclusive "HULK SUMO" SZSC004
$734
Verified Dealer
48
HK
Seiko Prospex Steel 45,00mm Blue No numerals
Seiko Prospex Sumo Blue Coral Sumo SBDC069
$880
Verified Dealer
444
PL
Seiko Prospex Steel 53mm Blue No numerals
Seiko SBDC069 SUMO Blue Coral Reef Prospex Special Edition
$574
Free shipping
Verified Dealer
136
JP
Seiko Prospex Steel 45mm Black
Seiko Prospex Automatik "Sumo" SPB125J1 Black Series Limited...
$971
Verified Dealer
137
AT
Seiko Prospex Steel 44mm Blue
Seiko Prospex
$337
Verified Dealer
151
JP
Seiko Prospex Steel 45mm No numerals
Seiko Japan Edition Prospex Sumo Automatic SBDC057 Pepsi
$999
Free shipping
Verified Dealer
150
SG
Seiko Prospex Steel
Seiko Prospex SBDC083 Diver 200m 3rd SUMO
$698
Verified Dealer
807
JP
Seiko King Steel 44.5mm Silver No numerals
Seiko Ultra RARE LE KING POWER Thai Market Silver Sumo SPB029J
$2,919
Verified Dealer
78
PH
Seiko Prospex Steel
Seiko Prospex Zimbe Sumo SPB055J (NEW, 1639 Limited)
$1,437
Verified Dealer
93
JP
Seiko Prospex Steel 52.6mm Black No numerals
Seiko PROSPEX 2019 "NEW SUMO" Automatic Watch SPB101J1 BLACK
$763
Verified Dealer
48
HK
Seiko Prospex Steel 45mm Black No numerals
Seiko Sumo SBDC031J1
$709
Verified Dealer
444
PL
Seiko Prospex Steel 52,6mm Blue
Seiko SBDC033 blue SUMO Prospex 200M Diver
$475
Free shipping
Verified Dealer
136
JP
Seiko Prospex Black
Seiko Prospex Diver Scuba SBDC031 - SBDC031
$812
Verified Dealer
834
JP
Seiko Prospex Blue
Seiko Prospex Diver Scuba SBDC033 - SBDC033
$618
Verified Dealer
191
HK
Seiko Prospex Steel 45mm No numerals
Seiko Japan Edition Prospex Sumo Automatic SBDC099
$1,499
Free shipping
Verified Dealer
150
SG
Seiko Prospex Steel Green No numerals
Seiko Prospex SZSC004 Green SUMO 200m Diver
$622
Verified Dealer
807
JP
Seiko Prospex Steel 45mm Blue No numerals
Seiko JDM JAPAN MADE Blumo Blue Sumo Diver's Watch SBDC033
$550
Verified Dealer
78
PH
Seiko Prospex Steel
Seiko Prospex Green Sumo SPB031J1 (NEW, Extremely Rare)
$2,987
Verified Dealer
93
JP
Seiko Prospex Steel 52.6mm Blue No numerals
Seiko PROSPEX 2020 Japan Exclusive "DEEP BLUE SUMO" SBDC099
$971
Verified Dealer
48
HK
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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.