Metal Content in these World Coins

Ok, I have really no cluw what I am doing with these..lol...so I decided to split up the copper with the silver, and put the silver first. So, what is silver here?

I think the half crowns are 50% but not perfectly sure on that:

plmk thanks:










stainless

 

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should be .500 fine in the threepence, cupro-nickel in the rest. Double-check, though.

 

I found out that the ones pre-1948 are. Thanks for the help

stainless