Wavy Antique Fish Bowl Identification

[Wolfmonkey]

Hello! :) I bought this bowl from a lovely lady who purchased it years ago at an antique shop in Greece. I have no idea who made it, when they made it or the value? It has two identification markings on the bottom. It also has waves or wrinkles molded into it. I am curious as to why they would make it wavy along the side structure?

[Wolfmonkey]

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[Wolfmonkey]

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[Wolfmonkey]

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[Stan]

This is Japanese, I can't read the Characters though, the high shine gives the impression that it is fairly recent made.