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Seiko Prospex Australia, Kingsdene
Seiko Prospex Black Sunburst Dial Sumo SPB101 SPB101J JAPAN...
AU$ 1,130
Verified Dealer
22
AU
Seiko Prospex Steel 45mm Green No numerals
Seiko Prospex Diver SPB103J1 Sumo Green Dial - New
AU$ 1,102
Free shipping
Verified Dealer
31
US
Seiko Prospex Steel 45mm Green No numerals
Seiko Prospex Sumo Green Dial Ref. SPB103J1
AU$ 1,318
Free shipping
Verified Dealer
286
PT
Seiko Prospex Steel 44mm Green No numerals
Seiko Prospex Diver Sumo Emerald Green Limited Edition FULL SET
AU$ 1,145
Verified Dealer
ES
Seiko Prospex Steel 45mm
Seiko SBDC027 "Sumo" 50th Anniversary (RARE & LIMITED)
AU$ 3,039
Verified Dealer
9
US
Seiko Prospex Steel Black
Seiko Prospex Scuba "Sumo"
AU$ 577
Private Seller
 
FR
Seiko Prospex Blue
Seiko Prospex Diver Scuba SBDC033 - SBDC033
AU$ 789
Free shipping
Verified Dealer
1839
US
Seiko Prospex
Seiko Prospex
AU$ 920
Verified Dealer
1253
SE
Seiko Prospex Steel 45mm Black
Seiko Prospex Automatic Air Diver Rare Limited Edition 2015 5531
AU$ 2,799
Verified Dealer
4198
IT
Seiko Prospex Steel 44mm Black Australia, Kingsdene
Seiko Prospex Sumo SBDC031 SBDC031J Calibre 6R15 Scuba Diver...
AU$ 660
Verified Dealer
AU
Seiko Steel 53mm Green No numerals
Seiko Sumo Green SZSC004
AU$ 836
Private Seller
 
US
Seiko Prospex Steel 45mm Blue No numerals
Seiko Prospex Sumo Pepsi
AU$ 741
Private Seller
 
FR
Seiko Prospex Steel Black
Seiko Prospex
AU$ 840
Private Seller
 
HU
Seiko Prospex Steel Blue
Seiko Sbdc 057 Pepsi
AU$ 783
Private Seller
 
HU
Seiko Steel 44mm White
Seiko Sumo Silver Surfer SPB029J1
AU$ 2,712
Private Seller
 
IE
Seiko Prospex Steel 45mm Yellow No numerals
Seiko "Yellow Sumo" SBDC017 diver (RARE & LIMITED)
AU$ 4,330
Verified Dealer
9
US
Seiko Prospex
Seiko NEW SUMO PROSPEX SBDC083 SPB101 DIVER 200M JAPAN MADE (NEW)
AU$ 1,214
Free shipping
Verified Dealer
58
US
Seiko Prospex Steel 45mm Blue
Seiko Prospex Automatic Diver 200M 45mm SBDC033J I
AU$ 987
Verified Dealer
4198
IT
Seiko Prospex Australia, Kingsdene
Seiko PROSPEX Sumo Green SPB103 SPB103J JAPAN Automatic Mens...
AU$ 1,100
Verified Dealer
22
AU
Seiko Prospex Steel 44mm Green No numerals
Seiko Green Sumo Limited Edition (365 of 550)
AU$ 2,963
Private Seller
 
US
Seiko Prospex Steel 45mm Black No numerals
Seiko Prospex "Sumo"
AU$ 1,260
Verified Dealer
1442
ES
Seiko Prospex Steel
Seiko PROSPEX DIVERS SUMO AUTOMATIC
AU$ 1,252
Verified Dealer
31
ES
Seiko Steel 45mm Green No numerals
Seiko JDM Seiko Sumo Emerald Green Hulk SZSC004 -NEW-Limited...
AU$ 1,481
Private Seller
 
ES
Seiko Prospex Steel 45,00mm Black
Seiko Prospex "SUMO" SBDC031 Cal. 6R15
AU$ 906
Free shipping
Verified Dealer
323
PL
Seiko Prospex Steel Blue
Seiko Prospex SBDC069 Blue Coral SUMO 200m Diver
AU$ 761
Verified Dealer
327
JP
Seiko Prospex Steel 45mm Green No numerals
Seiko Prospex SBDC081 SPB103 Diver 200m SUMO JAPAN MADE ( NEW )
AU$ 1,273
Free shipping
Verified Dealer
58
US
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
AU$ 685
Verified Dealer
85
JP
Seiko Prospex Blue
Seiko Prospex Diver Scuba SBDC033 - SBDC033
AU$ 771
Verified Dealer
616
JP
Seiko Prospex Steel 45mm Purple No numerals
Seiko International Edition Prospex Zimbe Sumo Purple SPB055J1
AU$ 4,557
Free shipping
Verified Dealer
100
SG
Seiko Prospex Steel 44mm Blue No numerals
Seiko Prospex SUMO
AU$ 1,071
Verified Dealer
1442
ES
Seiko Prospex Steel 45mm Green No numerals
Seiko Prospex Divers Sumo
AU$ 1,250
Verified Dealer
31
ES
Seiko Prospex Steel 45mm Yellow No numerals
Seiko SBDC017 Yellow SUMO Prospex Limited Edition 750 pcs.
AU$ 5,048
Free shipping
Verified Dealer
17
JP
Seiko Prospex Steel 45mm Black No numerals
Seiko Sumo SBDC031J1
AU$ 1,023
Free shipping
Verified Dealer
323
PL
Seiko Prospex Steel Green No numerals
Seiko Prospex SZSC004 Green SUMO 200m Diver
AU$ 906
Verified Dealer
327
JP
Seiko Prospex Steel Green No numerals
Seiko Prospex Prospex SZSC004 Green SUMO 200m Diver
AU$ 1,091
Free shipping
Verified Dealer
58
US
Seiko Prospex Steel 45mm Blue No numerals
Seiko Men's SBDC033J Prospex Sumo Blue Dial Watch
AU$ 789
Verified Dealer
1844
DE
Seiko Prospex Steel 45mm Black No numerals
Seiko PROSPEX Automatic Diver 200 Steel Black Dial 45mm
AU$ 857
Verified Dealer
2679
IT
Seiko Prospex Steel 45mm Green No numerals
Seiko International Edition Prospex Sumo Automatic SPB101J1
AU$ 1,670
Free shipping
Verified Dealer
100
SG
Seiko Prospex Steel
Seiko Prospex JDM Sumo Green SZSC004 (New, Extremely Rare)
AU$ 1,137
Verified Dealer
76
JP
Seiko Prospex Steel 45mm Blue
Seiko Uomo SBDC033J Prospex Orologio
AU$ 815
Verified Dealer
564
IT
Seiko Prospex Steel 53mm Blue No numerals
Seiko SBDC069 SUMO Blue Coral Reef Prospex Special Edition
AU$ 837
Free shipping
Verified Dealer
17
JP
Seiko Prospex Steel 45,00mm Blue No numerals
Seiko Prospex Sumo Blue Coral Sumo SBDC069
AU$ 1,357
Free shipping
Verified Dealer
323
PL
Seiko Prospex Steel
Seiko Prospex SBDC081 SBP103 Diver 200m 3rd SUMO
AU$ 1,017
Verified Dealer
327
JP
Seiko Prospex Steel 45mm Green No numerals
Seiko Prospex Sumo Green
AU$ 1,367
Verified Dealer
 
DE
Seiko Prospex Steel 45mm Blue No numerals
Seiko PROSPEX SEA DIVER SCUBA SUMO SBDC033J
AU$ 908
Verified Dealer
102
IT
Seiko Prospex Steel 45mm Blue No numerals
Seiko PROSPEX Automatic Diver 200 Steel Blue Dial 45mm
AU$ 857
Verified Dealer
2679
IT
Seiko Prospex Steel 45mm No numerals
Seiko Japan Edition Prospex Sumo Automatic SBDC099
AU$ 2,278
Free shipping
Verified Dealer
100
SG
Seiko Prospex Steel 45mm Blue No numerals
Seiko JDM JAPAN MADE Blumo Blue Sumo Diver's Watch SBDC033
AU$ 836
Verified Dealer
PH
Seiko Prospex Steel 45mm Green No numerals
Seiko Prospex Green Sumo Spb103j1 Men's Watch
AU$ 1,111
Verified Dealer
19
SG
Seiko Prospex Steel 52,6mm Blue
Seiko SBDC033 blue SUMO Prospex 200M Diver
AU$ 692
Free shipping
Verified Dealer
17
JP
Seiko Prospex Steel 45mm Blue No numerals
Seiko Prospex SBDC033J1
AU$ 1,023
Free shipping
Verified Dealer
323
PL
Seiko Prospex Steel
Seiko Prospex SBDC083 Diver 200m 3rd SUMO
AU$ 1,017
Verified Dealer
327
JP
Seiko Prospex Steel 45mm Black
Seiko Prospex Automatic Diver 200 45 mm SBDC031J I
AU$ 921
Verified Dealer
4198
IT
Seiko Prospex Steel 45mm Green
Seiko Prospex Sumo Diver 200m Green Automatic Spb103j1 Watch 45mm
AU$ 1,254
Verified Dealer
105
US
Seiko Prospex Titanium 44mm Black
Seiko Prospex Sbdc031 Watch
AU$ 819
Verified Dealer
717
NL
Seiko Prospex Steel No numerals
Seiko International Edition Prospex Sumo Chronograph SSC759J1
AU$ 1,366
Free shipping
Verified Dealer
100
SG
Seiko Prospex Steel Black
Seiko Prospex Automatik Diver Scuba Sumo SBDC031 NEU
AU$ 848
Verified Dealer
DE
Seiko Prospex Steel Blue
Seiko Prospex Black Sumo
AU$ 878
Verified Dealer
ID
Seiko Prospex Steel 53mm Green No numerals
Seiko SZSC004 Green Emerald SUMO Prospex Special Edition
AU$ 1,037
Free shipping
Verified Dealer
17
JP
Seiko Prospex Steel Black No numerals
Seiko Japan Edition Prospex Chronograph Diver 200 SBDL065 Sumo
AU$ 1,670
Free shipping
Verified Dealer
100
SG
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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.