Seiko Green Sumo SPB103J1

The Seiko Prospex Sumo has been first released in 2007. It gets its name from its size: a large 45mm width case! There has been numerous versions, with specific bezels or dials, plus many mods realized by the quite large community around Seiko watches. Seiko released the 3rd generation of the Sumo last year, with a refreshed appearance and a new movement, referenced SPB101J1 (black) and SPB103J1 (green).

Today I’m reviewing the SPB103J1, with green bezel and dial. Here are the full specs:

Stainless steel case, brushed and polished
Width: 45mm diameter x approx. 13.5mm
Height: 13.5mm
Lug to lug: 52.5mm
Sapphire crystal
Screw-down Steel caseback
Screw-down crown
200m water-resistant
Black or green dial
Applied indexes and hands, filled with lumibrite
Unidirectional rotating bezel in steel featuring a 60-minute diving scale on black or green inlay
Seiko Calibre 6R35
3Hz frequency – 24 jewels
70h power reserve
Bracelet:20mm – Stainless steel
Brushed with polished accents
Folding clasp with diving extension

This SPB103 is my first Sumo, but as soon as I passed it on my wrist I understood the general passion it’s been arousing since day one! It feels really light and comfortable, and has a huge presence on the wrist! The case is indeed quite large, but sits very well on the wrist thanks to slightly curved lugs. It’s well balanced, and the alternation of polished and brushed finishes is absolutely gorgeous!

This new generation is a bit thinner than the previous one, and has the advantage (at least I see it this way) to have a beautiful sapphire glass as opposed to the hardlex Seiko used to put on most dive watches in that price range. The glass is AR treated, providing a great legibility in all light conditions. It’s surrounded by an aluminium bezel, which I believe should have been replaced by a ceramic one. It may be a matter of personal taste, but I really prefer a scratch-proof inlay over an aluminium one.

The sunburst green dial is one of the most gorgeous I’ve been able to see. If I’m being honest, the only more beautiful green watch I’ve seen is the green Oris Aquis, this Sumo definitely plays with the best! It changes from light green to black depending on the light, a real eye candy! Now knowing Seiko, legibility has always been one of their strengths when it comes to dive watches. This Sumo makes no exception, being under the sun or in the dark, you won’t struggle to read the time!

One of the great features of this new generation is the new movement it integrates: the 6R35 replaces the 6R15 and comes with the most welcomed 70h power reserve! Unlike many Seiko 5, you won’t be able to see the movement. Like I already stated, when the movement isn’t decorated, I’d rather have an engraved steel caseback, like this one.

The bracelet has also got improved and is way more comfortable than the previous versions. I’ve never really liked Seiko’s bracelets (at least in their <1K€ range), but this one is really good and sits perfectly on my wrist. It even has the advantage of the diving extension.

The Seiko Sumo is a legendary piece which anyone interested in watches should try at least once! But be careful, should you try this new version, you will most likely want to get yours 🙂

By the way, on some pictures we may have noticed a green nato strap. It comes from RSM Watch Straps 👍

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