The third generation of the Seiko Sumo divers were recently released during Baselworld2019. The latest iteration has the two biggest changes in the design specification. First was the introduction of the new 6R35 movement to replace the workhorse 6R15 used in the previous two iterations. Second was the use of sapphire crystal instead of Hardlex crystal also used in the previous two iterations.Unfortunately, this fact was not lost to fans and the demand for the watch went ballistic. Shops practically sold out even before they got the chance to display on their shelves (the pre-order market was just incredible). I tried to get one but I was not high enough on the order list to get one from even the first, second or third batches to be delivered. Not many watches have such a high level of demand upon launching. This could be an indication how this piece be acknowledged 30 years from now.
Sometimes it is good to have relationship with a few authorised dealers instead of just one or two. In this case, the many relationship I made over the years with a few vendors proved invaluable. One of them came through and got an allocation which was quickly set aside for me. Debra of Style Watch, Mid Valley Megamall, a big thank you!!!
The New Seiko 2019 Sumo Series
Seiko launched two models under the new 2019 Sumo series. The first is the SPB101J1 with a non-reflective black dial and the second is the SPB103J1 with the sunburst green dial. The reference numbers which starts with "SPB" are standard when referred on a global basis. Both have the "J1" tag which means that they are Made-in-Japan timepieces. However, when these watches are sold in Japan, different reference numbers were used. In Japan, the designations are SBDC083 and SBDC081, respectively.
An interesting aspect of the referencing is that for the global audience, the black dial version came out first before the green dial version. However, in Japan, it would appear that the green dial version came first before the black dial version.
 SPB101J1 (in Japan SBDC083) MSRP: RM3,500; YEN85,000 |  SPB103J1 (in Japan SBDC081) MSRP: RM3,500; YEN85,000 |
I love green and I guess a lot of collectors also do. Nevertheless, trying to get the green version has been difficult to say the least. It is easier to land the black version. Despite the different demand profile, Seiko did not differentiate in terms of pricing.
In January 2020, Seiko announced a third model for this series. This particular one, the SPB125J1 is a limited edition of just 7,000 units and is slated to be available for sale in February 2020. This is also part of a special group of watches called The Black Series.
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| SPB125J1 The Black Series limited edition of 7,000 pieces MSRP YEN90,000 |
The Three Sumo Watch Generations
There are three generations of the Sumo line. The first generation was a set of three models launched in 2007. These are:
 | The SBDC001 with black dial |
 | The SBDC003 with blue dial. This model is part of my collection (click on this to go to the review on the watch). |
 | The SBDC005 with orange dial and rubber strap |
In the first generation there were three dial colours to choose from. Also, one of the model comes standard with a rubber strap.
In 2015, the second generation of the Seiko Sumo series was launched. This set has the most models with ten options. Some were standard production models, while some were limited edition timepieces. Based on the reference number, a few of the models were JDM timepieces not available outside Japan. Interestingly, some of the models were also unique to Thailand.
Generally, only cosmetic changes were made to the second generation when compared to the first generation. Nevertheless, for some of the limited edition pieces, more significant changes were made such as replacing the Hardlex crystal with sapphire.
 | The SBDC031 with black dial (JDM) |
 | The SBDC033 with blue dial (JDM) |
 | The SPB029 Silver Sumo King Power 25th Anniversary (Limited Edition for Thailand market. Only 1,965 units were made) |
 | The SPB031 Green Sumo Prospex 50th Anniversary (Limited Edition for Thailand market. Only 820 units were made) |
 | The SPB055J Purple Zimbe Sumo Thailand (Limited Edition for Thailand market. Only 1,693 units were made) |
 | The SBDC027 Prospex Sumo 50th Anniversary (Limited Edition. Only 2,000 units were made) |
 | The SBDC049 PADI Sumo (JDM. Limited Edition. Only 1,000 units were made) |
 | The SBDC057 with blue dial and Pepsi bezel (JDM) |
 | The SBDC069 Blue Coral (JDM) |
 | The SZSC004 Jade Green Sumo (JDM. Limited Production) |
The third generation Seiko Sumo series was launched in 2019. This series has the most significant change to the original specification. This series now come standard with sapphire crystal and a new movement, the 6R35 with 70 hours of power reserve compared to just 50 hours with the 6R15. Other cosmetic changes are in the hands, hour markers and the bezel markers.
 | SPB101J1 (in Japan SBDC083) |
| SPB103J1 (in Japan SBDC081) |
| SPB125J1 (Limited Edition. Only 7,000 units. This is only the second time a Sumo was issued without a bracelet. Launch date February 2020) |
The Watch
In my collection, I have the first generation Sumo, the JDM SBDC003. When the second generation Sumo was launched, I decided against getting one as I found that series to be virtually the same as before apart from the addition of the Prospex logo on the dial and some cosmetic changes like the colours on the dial and bezel.
When the latest iteration was launched during Baselworld2019, a number of key improvements were incorporated. Nevertheless, the new model has similar attributes such as the same 316L stainless steel construction for both the casing and bracelet and having similar dimensions. Like the previous iterations, the SPB103J1 has a width of 45.0 mm, length of 52.6 mm and lug width of 20 mm. However, there is some reduction in the thickness. Whereas the precurssor has a thickness of 13.5 mm, the SPB103J1's thickness is just 12.9 mm. This change is due to the new 6R35 movement (more about this later). Meanwhile, the casing is water rated up to 200 meters.
The Dial
Since I don't have a second generation Sumo for comparison, I will use my SBDC003 as a reference when reviewing the SPB103J1.
The SPB103J1 has the sunburst 'forest' green dial colour similar to that of the Marinemaster SLA019J1. The sloping chapter ring is also in the same colour and painted with white line minute markers in varying degree of thickness. The applied circular hour markers are similar to the predecessor but the isosceles trapezoid markers for 6 o'clock, 9 o'clock and 12 o'clock are slightly thinner. All primary hour markers are painted with a liberal dose of Lumibrite paint. Like the predecessor, the 3 o'clock hour marker has been replaced with a date aperture framed in white paint. The date wheel has a white background which helps compensate for the lost of the 3 o'clock hour marker.
The brand is painted in white on the upper quadrant of the dial. The rest of the texts as well as the Prospex logo is painted in white on the lower quadrant of the dial. The words "Automatic", "SCUBA", "200m" and "JAPAN 6R15-" which are on the SBDC003 have been replaced with the Prospex logo, "AUTOMATIC", "DIVER'S 200m" and "JAPAN 6R35-" on the latest iteration.
Another subtle change is the handset. While the seconds hand is similar, the minutes hand is now thinner while the hours hand no longer split the painted section into two. All hands are painted with Lumibrite on designated sections.
Protecting the dial is a flat sapphire crystal. This is the first time Seiko has included sapphire crystal as standard in a normal production Sumo. Unfortunately, Seiko did not put any AR protection for the crystal. When viewed at an angle, the level of reflection is obvious (see above).
The classic Sumo coin-edge bezel is still part of the SPB103J1. Note the way the side of the watch casing subtly protects the bezel edge. There is also a slight change on the font for the bezel. The numbers are not as thick as before. As required for a dive watch under the ISO 6425 standard, a luminous pip is provided on the bezel. The bezel moves a complete circle within a 120-click increment counterclockwise. The bezel mechanism is firm without any play.
Unlike the SBDC003, the crown on the SPB1003J1 is sterile without any markings. This is a pity. I would prefer something to be on the top of the crown. Even the very divisive Prospex logo would be preferable. If only Seiko would bring back the original deep cursive "S" cut for the crown top. On another note, the screw-down crown is sizeable for a good grip but it does take a couple of tries trying to engage the threads when screwing it down. It is not as smooth as a typical Swiss screw-down crown. I suspect the Japanese uses a tighter twist for the threads unlike the Swiss.
The styling of the solid, screw-down case-back is similar to the predecessor. The famous embossed tsunami graphic in the centre is Seiko's dive watch signature.
Underneath the case-back is the new 6R35 automatic movement. Introduced during Baselworld2019, this new caliber is a further improvement of the iconic workhorse, the 6R15. With an additional jewel bringing the total to 24 jewel, the 21,600 BPH or 3 Hertz movement has all the functionality of the 6R15 but now with an extended power reserve of 70 hours instead of 50 hours in the earlier model. At this juncture, I have yet to find any documents on the web detailing the complete specification of the caliber. However, based on the current height of the SPB103J1, I suspect the 6R35 to be thinner than the 6R15 by approximately 0.5 mm.I was able to do a quick accuracy test using the Toolwatch app straight out of the box. I was able to record an accuracy rate of +9.6 seconds per day on the first try. Seiko has stated that the 6R35 movement would register an accuracy of between +25 seconds per day to -15 seconds per day. This example is within the published limits.
The Illumination
The illumination on the SPB103J1 does not disappoint. As usual, Seiko it not stingy with the Lumibrite paint. Even with a quick exposure to artificial light, the paint was able to absorb a lot of energy and release it when in darkness.
The Bracelet
The inward curving lugs helps this watch feel comfortable on smaller wrist. Having drill-through lug holes also help facilitate strap replacement.
The solid links are connected by a pin-and-collar system. Although a proven technology, I expected Seiko to adopt the newer friction pin system used in a number of newer watches. The latest method eliminates the need for small parts (the small tube collar - see below).
The signed clasp is a folding unit with push-button lock plus safety latch. A wet suit extension is also provided. My only comment is the continuous use of stamped sheet metal for the bridge (see below). For the price one pays, I expect a machined piece for the bridge. The stamped metal parts make the watch feel 'cheap'.
The Purchasing Experience
Buying from a friendly dealer is always a pleasure. Style Watch of Midvalley Megamall is no exception. The salesperson, Ms. Debra is always smiling and helpful.
For this purchase, the only interesting item I got was a Lego set (top left). This is part of the mall-wide gift program that all merchants participate in. I suppose I will find a way to sell it off.
The only problem I got with the purchase was the wrong printed manual that came with the watch-box. What was given to me was the M-19 version of the 6R35 for MECHANICAL WATCH. However, what I should be given is the M-18 version of the 6R35 for DIVER'S WATCH FOR AIR DIVING instead. Anyway, at the end of this review is a digital version of the M-18 manual for reference.
The Wearing Experience
The size of the SPB103J1 is deceiving. Despite the substantive dimensions, the watch wears well on an average wrist. I have to say the design of the Sumo is truly form-over-function. The original Sumo design team created an evergreen design that is not only functional but ecstatically pleasing to the eyes and pleasantly wearable. These factors were the first thing that came to mind when I put on the SBDC003 for the first time years ago and when I got the SPB103J1 on the wrist, those feelings came flooding back from memory.
One of the reason why this watch is a legend in design is its ability to be at ease with formal wear. In the photo above, the shape of the concave casing helps reduce snagging especially with the cuff of shirts. Lets face it, only a very small percentage of the buyers of the Sumo actually used it for diving. The vast majority will only dream of diving.
Can Seiko improve the Sumo further? Of cause it can! All it needs to do is just listen to feedback by fans. There are a few that warrant consideration by Seiko.
- The clasp system: The current stamp sheet metal bridge cheapens the watch. Seiko should consider machined parts instead. The simple diver's extension should also be replaced with a more 'premium' system such as the one found on the 300M, 600M and 1000M Marinemasters.
- The bezel insert: Instead of just aluminium insert, consider ceramic, sapphire crystal or even Hardlex as possible alternatives. These materials have been used before by Seiko in a number models such as on the SLA019 (ceramic), SBGE001 (sapphire) and SNZH53J1 (Hardlex).
- The strap option: To make the ownership experiencing more meaningful, I would like to suggest Seiko re-design the packaging to also include an additional strap apart from the bracelet. It will really be seen as being progressive especially by fashion conscious owners. Adding a signed strap replacement tool will also be much appreciated. This method of presentation has been used before, for example on the SLA017J1 offering.
- The crystal shape: Although we know why Seiko chose a flat crystal (reduce the likelihood of side impact), considering a dome shape or even a box shape for the crystal would enhance the visual beauty of the watch many times over. Since a lot of people will take the effort to modify their watches by replacing the existing crystal to a dome shape or a box shape alternative, why not give that option straight from the start? For example, the SRPB61K1 (dome crystal) and SRQ031J1 (box crystal).
Instead of allowing people of do it on their own, why not take charge and provide alternatives, loads of it by allowing buyers to mix-and-match the specifications. Some brands have already done so with smart on-line applications on their website that allow potential customers to customize their dream timepiece to order.
Specifications
Reference: SPB103J1
Case Material: Stainless steel
Strap: Stainless steel bracelet, 190 mm maximum wrist size
Clasp: Folding with push-button lock plus safety latch; A wet suit extension is provided
Dial Colour: Sunburst green
Crystal: Sapphire
Crown: Screw-down
Case-back: Solid screw-down
Bezel: Unidirectional turning, counterclockwise
Dimension: Height 12.9 mm; Width 45 mm; Length 52.6 mm
Lug Width: 20 mm
Weight: 188 gm
Water Rating: 200 meters
Movement: Caliber 6R35 automatic
Jewels: 24
Power Reserve: 70 hours
Functions: Date, manual winding, seconds hand stop mechanism
Accuracy: +25 seconds per day to -15 seconds per day
MSRP: EUR850; RM3,500; YEN85,000
Launch Date: 21 June 2019
Purchase Date: 6 January 2020
Serial Number: 902037
Purchase Price: RM2,600
Dealer: Style Watch, Mid Valley Megamall
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