$547.88 USD
$547.88 USD


OCEANUS OCW-S100B-1AJF/ List price: 84,240 JPY
(Made in Japan)


Crystal: Sapphire with non-reflection coating
Case & Bracelet: Black Ion plated
Water resistant 10 ATM
Solar Battery
Atomic wave, JP, US, EU & China/ World Time: 29 cities
Battery power indicator/ Power Saving
Diameter :41.5mm Without the crown
Wrist size max 20cm/ 7.9in
Instruction No. 5235

Instructions (JP)/ Original Casio Oceanus box/ Worldwide one year warranty

Free worldwide shipping

Customer Reviews

Based on 20 reviews
Art H.
Elegant and Practical

Ultra simplified and brilliant design along with its impeccable quality, this watch sets the bar higher that others can reach. If you need just one watch for daily use, and CASIO OCEANUS OCW-S100B-1AJF is definitely the one you should consider. Paired with Seiya's reliable shipping service, this is a truly pleasant purchase.

Solomon L.
The Oceanus OCW-S100B-AJF is a

The Oceanus OCW-S100B-AJF is a terrific and beautiful watch. The fit is excellent, and being titanium, it is light on the wrist. The watch is very legible, and I love the black date wheel, which adds to its stealthiness. The bracelet is extremely comfortable and is the best way the watch should be worn. It’s a solid piece, with incredible accuracy, and I never get tired of seeing the seconds hand hitting the markers. This could be a one-watch collection, and even if it isn’t (it isn’t for me), I find myself wearing it more and more, alongside my Oceanus T-200, which is also excellent.
Seiya’s service is excellent and dependably so. The watch and the dealer are both highly recommended.

Suk Y.
Beautiful watch and quickly delivered,

Beautiful watch and quickly delivered, great service as noted by other reviewers. Appreciate the quick shipping and notifications.

Ronald J.
Excellent experience. I now own

Excellent experience. I now own this watch in both colors. Either of them are the only watch one ever should need.

Wayne F.
Brilliant watch, amazing seller

I've been burned so many times purchasing things online that I admit I was hesistant to order from Seiya Japan - however after reading multiple reddit threads saying they order with complete trust, seeing youtubers recommend this seller , I dove in. I couldn't believe I got this watch in under 5 days (and over a weekend).
Now onto the watch, I have to keep checking my wrist to make sure it's on because it is so light. The fit and finish feel so good and it feels super comfortable on my smaller wrist. It's a classic, sharp design with so many unassuming features.

I would recommend this watch and seller one thousand times over.

Thank you so much! I will absolutely be a future customer

Tim L.
This is a really nice

This is a really nice and underrated watch. The Multiband 6 time setting works perfectly and is super convenient and the finishing is excellent. It is also very surprising how little light the watch needs to keep running. Fantastic service from Seiya as usual.

Frederic B.
Just perfect !

Just perfect !

Thomas C.
Wonderful Watch and Even Better Service

This is a beautiful and functional watch. This is the 2nd watch I've purchased from Seiya and their service is the best of any retailer I have ever known! They sell a quality watch, in a simple manner, and shipped it to the US in 5 days. Amazing. I'll be back for that Grand Seiko soon.

James M.
This is one of the

This is one of the very best values in watches, when you compare cost versus quality, materials, features, and function. It’s a beautiful piece, light and comfortable yet substantial in all the right ways. This watch has quickly become my favorite as it works equally well in casual or dressy settings. Highly recommended. And SeiyaJapan is top notch. Provides a seamless buying process with very competitive pricing. Also highly recommended.

Lauri L.
Delightful watch and service

This watch is just what i expected but the delivery process went past all expectations. From order to delivery to Finland, it took less time than it took from customs to deliver it to me inside Finland. It still took only like 6 working days total to get my hands on it. So there's that..