Tenpo Koban from 1837, Daikichi - Model: Tenpo Koban - Year: 1837 - Markings: Multiple markings Regarding the Koban, I am a complete novice, so I do not know if it is genuine. Therefore, I cannot provide detailed information, but it did not react to a magnet. Weight: 11g I am offering this for those who collect Koban. Due to the above reasons and to prevent product replacement, returns and claims are not accepted. Please understand this before purchasing.