Just forget the whole thing!
Even if the whole collection was of gold 99.99% pure, by weight,
it is only worth $61.355. Putting that $389.99 into silver rounds
would serve you better in the long run.
Owning precious metals is about wealth store, but you NEED
convertibility, and with that collection, you would need to
find another person interested in Samurai artifacts.
In fact, at current spot prices, a tube of 20 rounds should cost
you less than $320.00. And when you need cash, any coin broker
will be willing to take them off your hands.
RE: Currency of the Samurai