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Alex, that stamp on the side is the address for Sazare, the company registered to the same owner as 330mate.com as well as Fujibato.com. There is no phone number.

In addition, I'd like to ask you...

Not necessarily, people have got good stones from him, or so I hear, but...for example, that big shiny patch in one corner? Top left in the first pic? You might want to be very careful with that. An...

All 330mate stamps say the same thing: this stone came from 330mate.

You don't really need to know anything else.