This is an Akama inkstone. I received it from the president of a business partner a long time ago, who explained that it was a valuable inkstone. However, I haven't used it, and it has been stored for about 40 years. I am selling it now because I am planning to move. My name and the sender's name are engraved on the back. I don't know anything else about the inkstone's maker. I heard the price was high, so I'm starting the bidding at 50,000 yen, but if anyone knows more about it, please let me know.