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Seiko Prospex Steel 45mm Blue No numerals
Seiko PROSPEX SEA DIVER SCUBA SUMO SBDC033J
RM2,589
Verified Dealer
102
IT
Seiko Prospex Steel Blue
Seiko Prospex
RM1,697
Private Seller
IN
Seiko Prospex
Seiko NEW SUMO PROSPEX SBDC083 SPB101 DIVER 200M JAPAN MADE (NEW)
RM2,966
Free shipping
Verified Dealer
16
US
Seiko Prospex Steel 53mm Green No numerals
Seiko SZSC004 Green Emerald SUMO Prospex Special Edition
RM2,934
Free shipping
Verified Dealer
 
JP
Seiko Steel 45mm Green No numerals
Seiko JDM Divers Sumo "HULK" Emerald Green Limited Edition...
RM2,815
Private Seller
ES
Seiko Prospex Steel Black No numerals
Seiko Sumo Seiko Sumo SBDC001 2010
RM2,115
Private Seller
 
FR
Seiko Steel 53mm Green No numerals
Seiko Sumo Green SZSC004
RM2,546
Private Seller
 
US
Seiko Prospex Steel 45mm Blue
Seiko Prospex Automatic Diver 200M 45mm SBDC033J I
RM2,815
Verified Dealer
3962
IT
Seiko Steel 45mm Black No numerals
Seiko SBDC001 SUMO DIVER WATCH Collectable
RM1,655
Private Seller
 
HK
Seiko Steel 44mm
Seiko Automatik Sumo SBDC031
RM3,426
Verified Dealer
 
AT
Seiko Steel 45mm Green No numerals
Seiko JDM Seiko Sumo Emerald Green Hulk SZSC004 -NEW-Limited...
RM2,815
Private Seller
 
ES
Seiko Prospex Steel 45mm Green No numerals
Seiko Prospex Sumo Hulk
RM3,628
Private Seller
 
UK
Seiko Prospex Steel 45mm Blue No numerals
Seiko Prospex Sumo Diver
RM3,713
Private Seller
 
HU
Seiko Steel
Seiko SBDC049 SUMO PADI
RM4,230
Private Seller
 
IT
Seiko Prospex Steel 45mm Blue
Seiko Blue Sumo, Blumo, SBDC033
RM2,279
Private Seller
 
AT
Seiko Prospex Steel Blue
Seiko Prospex
RM2,339
Private Seller
 
HU
Seiko Prospex Steel 45mm
Seiko Prospex Sumo Diver's 200m
RM3,196
Private Seller
 
ES
Seiko Prospex Steel 45mm Black
Seiko Prospex Automatic Air Diver Rare Limited Edition 2015 5531
RM7,985
Verified Dealer
3962
IT
Seiko Steel 44mm
Seiko Automatik Sumo SBDC033
RM3,755
Verified Dealer
 
AT
Seiko Prospex Steel 45mm Black
Seiko Prospex
RM2,197
Private Seller
 
HU
Seiko Prospex Steel 44mm Green No numerals
Seiko Green Sumo Limited Edition (365 of 550)
RM8,275
Private Seller
 
US
Seiko Prospex
Seiko Prospex
RM2,616
Free shipping
Verified Dealer
1053
SE
Seiko Prospex Steel 42mm Blue
Seiko Prospex
RM1,549
Verified Dealer
66
JP
Seiko Prospex Steel 45mm Green No numerals
Seiko Prospex Divers Sumo
RM3,567
Verified Dealer
12
ES
Seiko Prospex Steel 45mm Green No numerals
Seiko Prospex Sumo Green Dial Ref. SPB103J1
RM3,760
Free shipping
Verified Dealer
269
PT
Seiko Prospex Steel Black
Seiko Prospex
RM2,381
Private Seller
 
HU
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex "Sumo"
RM3,595
Verified Dealer
1382
ES
Seiko Prospex Steel
Seiko Prospex Sumo Divers Watch SBDC083
RM3,547
Verified Dealer
27
SG
Seiko Prospex Steel 44mm Black
Seiko SBDC001 Prospex Diver
RM1,856
Verified Dealer
17
NL
Seiko Prospex Steel 45mm Green
Seiko Prospex Green Sumo Automatic Diver 200m Sbdc081 Stainles...
RM3,607
Verified Dealer
95
US
Seiko Marinemaster Steel 45mm Black No numerals
Seiko Prospex Sumo SBDC027 Limited Edition Mod, Marinemaster...
RM4,225
Private Seller
DE
Seiko Prospex Steel 45mm Blue
Seiko セイコー ダイバー スキューバー SBDC033 メンズ 腕時計 未使用 展示品
RM1,936
Verified Dealer
66
JP
Seiko Prospex Steel
Seiko PROSPEX DIVERS SUMO AUTOMATIC
RM3,572
Verified Dealer
12
ES
Seiko Prospex Steel 45mm Black No numerals
Seiko PROSPEX Automatic Diver 200 Steel Black Dial 45mm
RM2,444
Verified Dealer
2366
IT
Seiko Prospex Steel 45mm Purple No numerals
Seiko International Edition Prospex Zimbe Sumo Purple SPB055J1
RM12,726
Free shipping
Verified Dealer
74
SG
Seiko Prospex Steel 44mm Blue No numerals
Seiko Prospex SUMO
RM3,055
Verified Dealer
1382
ES
Seiko Prospex Steel 45mm
Seiko SBDC027 "Sumo" 50th Anniversary (RARE & LIMITED)
RM8,487
Verified Dealer
7
US
Seiko Prospex Steel
Seiko Prospex SBDC081 Diver 200m 3rd SUMO
RM2,738
Verified Dealer
53
JP
Seiko Prospex Steel Black
Seiko Prospex Automatik Diver Scuba Sumo
RM2,486
Verified Dealer
21
DE
Seiko Prospex Steel 45mm Blue
Seiko Uomo SBDC033J Prospex Orologio
RM2,326
Verified Dealer
411
IT
Seiko Prospex Steel 45mm Blue No numerals
Seiko JDM JAPAN MADE Blumo Blue Sumo Diver's Watch SBDC033
RM2,334
Verified Dealer
PH
Seiko Prospex Steel 45mm Black
Seiko Prospex Automatic Diver 200 45 mm SBDC031J I
RM2,627
Verified Dealer
3962
IT
Seiko Prospex Steel 45mm Blue No numerals
Seiko PROSPEX Automatic Diver 200 Steel Blue Dial 45mm
RM2,444
Verified Dealer
2366
IT
Seiko Prospex Steel 45mm Blue No numerals
Seiko Japan Edition Prospex Sumo Automatic SBDC033
RM3,815
Free shipping
Verified Dealer
74
SG
Seiko Prospex Steel 45mm
Seiko sbdc057
RM2,381
Private Seller
HU
Seiko Prospex Steel 45mm Yellow No numerals
Seiko "Yellow Sumo" SBDC017 diver (RARE & LIMITED)
RM14,428
Verified Dealer
7
US
Seiko Prospex Steel Blue
Seiko Prospex SBDC069 Blue Coral SUMO 200m Diver
RM1,942
Verified Dealer
53
JP
Seiko Prospex Steel Blue
Seiko Prospex Black Sumo
RM2,453
Verified Dealer
ID
Seiko Prospex Steel Green No numerals
Seiko Prospex SZSC004 Green SUMO 200m Diver
RM2,562
Verified Dealer
53
JP
Seiko Prospex Steel
Seiko Prospex SBDC083 Diver 200m 3rd SUMO
RM2,738
Verified Dealer
53
JP
Seiko Prospex Steel 45mm Green No numerals
Seiko International Edition Prospex Sumo Automatic SPB103J1
RM4,663
Free shipping
Verified Dealer
74
SG
Seiko Prospex Steel 45mm Green No numerals
Seiko International Edition Prospex Sumo Automatic SPB101J1
RM4,663
Free shipping
Verified Dealer
74
SG
Seiko Prospex Steel 45mm Black No numerals
Seiko Japan Edition Prospex Sumo Automatic SBDC031
RM3,815
Free shipping
Verified Dealer
74
SG
Seiko Prospex Steel 44mm Black
Seiko Prospex "Sumo"
RM1,443
Private Seller
 
US
Seiko Prospex Steel 45mm Green No numerals
Seiko Japan Edition Prospex Sumo Automatic SZSC004
RM4,239
Free shipping
Verified Dealer
74
SG
Seiko Prospex Steel 45mm Blue No numerals
Seiko Japan Edition Prospex Sumo Automatic SBDC069
RM4,239
Free shipping
Verified Dealer
74
SG

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.