Very Old Chinese/Japanese Coins looks like shipwreck coins [opgelost]

Good day please see attached photo , I can barely make out what it is but there are def some Chinese/Japanese symbols on these coins. I don't know what material it is but it looks like some sort of metal/tin/zinc/iron.

Any info would be appreciated. Thanks

https://en.numista.com/forum/topic71935.html

https://en.numista.com/catalogue/index.php?e=china&r=cash&ct=coin&tb=y&tc=y&tn=y&tp=y&tt=y&cat=y&ru=&ca=3&no=&v=&i=&b=&d=&u=&a=&dg=&m=&f=&t=&w=&mt=&g=&se=&c=&wi=&sw=

Citeer: "iiruig"​https://en.numista.com/catalogue/index.php?e=china&r=cash&ct=coin&tb=y&tc=y&tn=y&tp=y&tt=y&cat=y&ru=&ca=3&no=&v=&i=&b=&d=&u=&a=&dg=&m=&f=&t=&w=&mt=&g=&se=&c=&wi=&sw=

​appreciate the info.