Tempo koban were minted between 1837 and 1858.
It is made of 56.8% gold and 43.2% silver, and weighs 11.2 grams.
It is also called "Hoji koban" because the seal on the reverse side is the character for "Ho.
Hisanaga is one of the seven lucky koban.
Comes with a certificate of authenticity and a paulownia box.