Hi,
First time poster - I am currently in Tokyo and purchased some coins including this Tempo Goryoban. My understanding is that these are quite rare due to the large size and high gold content compared to the typical 1 Ryo Kobans. They also only produced these during a short period of the Tempo era between 1837 and 1843.
It is also my understanding that there are different "mint masters" that produced these coins, as stamped in the lower leftside of the reverse. My particular one is a "Kawashichi" (literal translation "River 7").
Are there any Japanese coin experts on this board that can provide any more information about this coin, or perhaps point me towards some resources to learn more about it?
Thanks!
Abby

