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Jim, I'll post the info here so anyone else can have access to it.

First in Japanese:

叶山革砥製作所
東京都台東区浅草２丁目１７－８
電話番号：０３－３８７３－０７１０

Now in English/Romaji:

Hey Jim, if you want to call up the Kanayama Leather Strop Company to find out, I have their address and phone number.