I am somewhat new to the collecting of strikes, having only 20 of them. I keep seeing the term "copper rim" coming up. Are there various types of rims on strikes and how can you tell a copper rim from a brass/whatever rim? Why do the copper rims generally sell at higher prices?

Also, are $20's and $40 strikes more limited in their editions. What is the general release quantity for $10's versus $20's and $40's.

Thanks all for your help...Ron