Maybe I'm missing something very obvious but there's 2 sales recorded on the coin page you linked, one for JPY 230,000 (2,000 USD today) and one for a coin in VF condition for JPY 36,000 (314 USD today). Neither of those sounds pretty pretty cheap to me.
Quote: "cgy158"It's actually a Japanese coin, see https://en.numista.com/catalogue/pieces283929.html
I have no idea if it is a genuine one, but even a genuine one would still be pretty pretty cheap
Maybe I'm missing something very obvious but there's 2 sales recorded on the coin page you linked, one for JPY 230,000 (2,000 USD today) and one for a coin in VF condition for JPY 36,000 (314 USD today). Neither of those sounds pretty pretty cheap to me.
Even NGC shows it at 300 USD for VG condition.
https://www.ngccoin.com/price-guide/world/japan-mon-km-15-1626-cuid-1167186-duid-1447930
Oops I attached the link to a very rare version of it - you could search Kan'eitsūhō on this site yourself and check which version it belongs to. Normally it takes no more than 3 USD.