Seiko Prospex 200m Diver SRP637 (or SRP637K or SRP637K1) Shrouded Black Monster (a.k.a. Monster Tuna) - A modern transformation of the original Monster to something bigger and stylish, A Review

I just love the metallic shrouds on high end Seiko dive watches. I have collected three shrouded diver examples from Seiko over the years; the SBDX011 ‘Emperor Tuna’, the SRP653 ‘Baby Tuna’ and the SUN019P1 'Vader-Tuna-Turtle' (although I got another shrouded watch from Seiko, the SBDC011 Fieldmaster is not a diver hence the reason I excluded it from the list). A few years ago, Seiko incorporated the shrouded concept to the Monster series with the launch of the SRP233, SRP234 and SRP236. However, what put me off from looking into that series further was the fact that the shroud was made out of plastic. Nevertheless, the price point and size were just nice to be able to be an affordable and wearable wristwatch to many people.


This year, Seiko answered the request by its legion of fans to come out with a new series of shrouded Monsters by introducing the SRP637, SRP639 and SRP641 series. This time around the shroud is made out of metal! What makes it even more special is that it has been upgraded to be under the Prospexseries of professional tool watches.

I immediately made the necessary inquiries to get the best price possible from some of my trusted suppliers. However, the demand was so great that the initial consignment for Malaysia was sold out in a matter of weeks. As it was also the same time since the introduction of GST into the country, I was not willing to get a unit from my overseas suppliers as I was not comfortable yet with the new custom rules and procedures for imports. So, I waited for the supply to catch up with demand.

After a few months I finally got my hands on the Seiko SRP637. The watch is sizable. It comes with a diameter of 47.5 mm (excluding crown) and a lug-to-lug distance of 50 mm. Coupled with a thickness of 14 mm, the watch makes it presence obvious on one’s wrist.

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