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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
17
US
Seiko Prospex Blue United States of America, California, Burlingame
Seiko Prospex Diver Scuba SBDC033 - SBDC033
$599
Free shipping
Professional dealer
3897
US
Seiko Prospex Steel 44mm Black United States of America, Florida, Pompano Beach
Seiko Scuba Sumo SBDC001 Rare Pre-Prospex No X Black Dial...
$895
Professional dealer
195
US
Seiko Prospex Steel 45mm Green No numerals United States of America, Ohio, USA
Seiko Prospex SBDC081 SPB103 Diver 200m SUMO JAPAN MADE ( NEW )
$854
Free shipping
Professional dealer
223
US
Seiko Prospex Steel
Seiko Prospex PADI Collaboration SBDC049 (NEW, 1,000 Limited)
$1,387
Professional dealer
110
JP
Seiko Prospex Steel 44.5mm Black No numerals
Seiko Sumo Prospex Chronograph NINJA Solar Black Series...
$1,222
Professional dealer
21
AT
Seiko Prospex Steel 45mm Yellow
Seiko Prospex Zimbe 15 (Sumo) Limited Edition. New&Unused Only...
$1,344
Private Seller
TH
Seiko Prospex Steel 45mm Blue
Seiko Prospex
$734
Professional dealer
101
IT
Seiko Prospex Steel 45mm Blue No numerals
Seiko Pepsi Prospex Sumo Ref. SBDC057 - Full Set
$826
Free shipping
Professional dealer
467
PT
Seiko Prospex Steel
Seiko Prospex SBDC081 SBP103 Diver 200m 3rd SUMO
$653
Professional dealer
1925
JP
Seiko Prospex Black United States of America, California, San Mateo
Seiko Prospex Diver Scuba SBDC031 - SBDC031
$799
Free shipping
Professional dealer
3897
US
Seiko Prospex Steel 44mm Blue United States of America, Florida, Pompano Beach
Seiko Scuba Sumo SBDC001 BLUMO Rare Pre-Prospex No X Blue Dial...
$995
Professional dealer
195
US
Seiko Prospex Steel Black United States of America, Ohio, USA
Seiko NEW SUMO PROSPEX SBDC083 SPB101 DIVER 200M JAPAN MADE (NEW)
$799
Free shipping
Professional dealer
223
US
Seiko Prospex Steel Black
Seiko Prospex Seiko Sumo SBDC027 limited edition
$1,958
Private Seller
IT
Seiko Prospex Steel Blue
Seiko Sumo Miltat president bracelet
$495
Private Seller
 
UK
Seiko Prospex Steel 44mm Blue No numerals
Seiko Prospex
$831
Professional dealer
21
AT
Seiko Prospex Steel
Seiko PROSPEX SUMO 50th ANNIVERSARY LIMITED EDITION SUPER RARE...
$1,848
Private Seller
TH
Seiko Prospex Steel
Seiko Prospex Zimbe Sumo SPB055J (NEW, 1639 Limited)
$1,397
Professional dealer
110
JP
Seiko Prospex Steel 45mm Green No numerals
Seiko Prospex Diver Sumo SPB103J1 Automatic Green
$734
Private Seller
 
IT
Seiko Prospex Steel 43,5mm Green No numerals
Seiko Prospex Ref. SZSC004 Green SUMO 200m Diver
$1,101
Free shipping
Professional dealer
467
PT
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
195
US
Seiko Prospex Steel Green No numerals United States of America, Ohio, USA
Seiko Prospex Prospex SZSC004 Green SUMO 200m Diver
$899
Free shipping
Professional dealer
223
US
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex SUMO SPB101J1 Sapphire crystal Cal 6R35 Made in...
$887
Professional dealer
542
ES
Seiko Prospex Steel 44mm Black No numerals
Seiko Prospex Sumo
$496
Private Seller
 
DE
Seiko Steel 45mm
Seiko Sumo blue (Blumo)
$502
Private Seller
 
DE
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex Black Sumo
$1,076
Professional dealer
21
AT
Seiko Prospex Steel
Seiko Prospex JDM Sumo Green SZSC004 (New, Extremely Rare)
$748
Professional dealer
JP
Seiko Prospex Steel 45mm Green No numerals
Seiko Prospex Diver´s «Sumo Green»
$875
Professional dealer
1838
ES
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex Diver´s Sumo Ref. SPB101J1EST
$1,175
Free shipping
Professional dealer
467
PT
Seiko Prospex Steel Blue
Seiko Prospex SBDC033 SUMO
$426
Private Seller
 
JP
Seiko Prospex Steel 44mm Black
Seiko Prospex Sumo Diver Scuba SBDC031
$525
Private Seller
 
GR
Seiko Prospex Steel 44,5mm Black
Seiko Sumo
$1,137
Private Seller
 
FR
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex SUMO spb125 black limite edition
$918
Private Seller
 
IT
Seiko Prospex Steel 45mm Blue No numerals
Seiko Prospex limited PADI
$1,958
Private Seller
 
DE
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex Sumo SPB101J new unworn b&p
$1,021
Professional dealer
107
UK
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex 3rd Gen Sumo Black SBDC083 SPB101J1 Diver's 200M...
$820
Private Seller
 
HR
Seiko Prospex Steel 44mm Blue No numerals
Seiko Sumo SBDC003
$642
Private Seller
 
NL
Seiko Prospex
Seiko Zimbe Sumo prospex SPB055J Thanos
$1,835
Private Seller
 
BE
Seiko Prospex Steel 45mm Blue No numerals
Seiko Prospex Blue Sumo
$617
Private Seller
 
UK
Seiko Prospex Steel 44mm Green
Seiko Sumo 50th Anniversary Limited Edition SPB031J1
$2,568
Private Seller
 
NL
Seiko Prospex Steel 45mm Blue
Seiko Prospex
$710
Private Seller
 
IT
Seiko Steel Black No numerals
Seiko Sumo Diver Chronograph Solar
$734
Private Seller
 
FR
Seiko Prospex Steel 44mm Orange No numerals
Seiko Sumo SBDC005 Automatic SCUBA 200m ORANGE Dial Pre-X
$1,359
Private Seller
 
IT
Seiko Steel Blue Arabic numerals
Seiko Sumo Seiko Sumo SPB029J1 Limited edition
$2,325
Private Seller
 
ES
Seiko Steel 45mm No numerals
Seiko Sumo SBDC113 Japan Limited Edition
$1,591
Private Seller
 
IT
Seiko Prospex Steel 43mm Black Arabic numerals
Seiko Prospex Diver Scuba SBDC069 (NEW, Rare Watch)
$638
Professional dealer
110
JP
Seiko Prospex Steel 44mm Blue No numerals
Seiko Prospex SUMO
$795
Professional dealer
1838
ES
Seiko Prospex Steel 45mm Green No numerals
Seiko Green Sumo Prospex
$703
Professional dealer
464
SG
Seiko Prospex Blue
Seiko Prospex Diver Scuba SBDC033 - SBDC033
$560
Professional dealer
1389
JP
Seiko Prospex Steel 45mm Green No numerals
Seiko International Edition Prospex Sumo Automatic SPB195J1...
$1,650
Professional dealer
9
HK
Seiko Prospex Steel 45,00mm Blue No numerals
Seiko Prospex Sumo Blue Coral Sumo Sbdc069
$954
Free shipping
Professional dealer
648
PL
Seiko Prospex Steel 44.5mm Black Arabic numerals
Seiko SSC795J1 Prospex PADI Sumo Black Dial Solar Watch
$801
Professional dealer
4074
DE
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex Diver Sumo SPB101J1 Stainless Steel Black Bracelet
$783
Professional dealer
331
IT
Seiko Prospex Black
Seiko Prospex Diver Scuba SBDC031 - SBDC031
$958
Professional dealer
694
DK
Seiko Prospex Steel
Seiko Prospex Green Sumo SBDC019 (NEW, 550 Pcs, Extremely Rare)
$3,987
Professional dealer
110
JP
Seiko Prospex Steel 44.5mm Blue No numerals
Seiko Prospex Solar Diver's Sumo
$697
Professional dealer
1838
ES
Seiko Prospex Steel 45mmmm Black No numerals
Seiko Prospex Automatic NEW SUMO Watch Sub Black Dial 45mm...
$832
Professional dealer
3941
IT
Seiko Prospex Steel Blue
Seiko Prospex
$581
Professional dealer
464
SG
Seiko Prospex Steel
Seiko Prospex Sumo Scuba Gray Japan Limited SBDC097 Watch
$885
Professional dealer
1925
JP
Seiko Prospex Steel 52.6mm Brown No numerals
Seiko Final Call Seiko Prospex 2020 Asia "HAWKSBILL TURTLE"...
$911
Professional dealer
264
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.


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