Old Japanese Coins

I picked up these Mameita Gin at an estate auction a while ago and now somebody is wanting to buy them off me, but I have no idea what a fair price would be.

Fronts, backs, and weights
https://imgur.com/a/iUAoCGA
Sizes relative to US currency
https://imgur.com/a/7ahzaTs

Bump
Anybody have an idea?

Quote: "Pyrolizard"​Anybody have an idea?

You could try a eBay auction ​

Quote: "KLiao"​​You could try a eBay auction ​

​That's part of the problem. There aren't many sold listings on eBay and most of them are admitted fakes, and I don't feel comfortable judging the condition and quality of mine compared to the one or two potentially authentic ones.