G-Shocks are engineered in Japan and manufactured in China, Thailand, and Japan. High End and exclusive G-Shock watches such as the Frogman are exclusively manufactured in Japan where they are meticulously made and undergo the highest quality assurance and testing. February 20, 2022.
The buckle of an original G Shock is quite shiny with 'CASIO CHINA' written on the back side whereas, the fake one will have a matte finish with 'CASIO JAPAN' written on it. 4.The Back Plate and Screws: This is another important differentiator. The real one is deeply engraved but in a fake watch, the case is not the same. Both contain the same low-cost Japanese quartz movement and the functions operate in the same manner. Unfortunately, Casio don't give us much information about these. As far as I know, the A158W is predominantly made in China; they do make an A159 version, which is essentially the same but is apparently made in Japan and is more expensive. Seiko Group Corporation (セイコーグループ株式会社, Seikō Gurūpu kabushiki gaisha), commonly known as Seiko (/ ˈ s eɪ k oʊ / SAY-koh, Japanese:), is a Japanese maker of watches, clocks, electronic devices, semiconductors, jewelry, and optical products.Founded in 1881 by Kintarō Hattori in Tokyo, Seiko introduced the world's first commercial quartz wristwatch in 1969.
A store that sells Casio watches. It's not authorised dealer or something like that. My original concern was "made in China", which others people have confirmed that the original watch is made in China and not in Japan

Some of these ones definitely are, or if not made in China, at the very least cased in China (with the module or movement being the only thing Japanese). If I was to guess I'd say only the higher end G-Shocks and the Oceanus line are 100% Japan these days.

Casio G-Shock watches made in Thailand. Casio's G-Shock production is in Japan, Thailand and China. Their top end are generally made in Japan, and mid and low end in China and Thailand. They mark country of manufacture quite clearly, and on their website you can clearly see it on the case back with the pictures they provide.
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  • are casio watches made in china