James, it sounds like your collection is of the $7 strikes, not the $10 strikes. The $7 strikes are made of just the silver while the $10 strikes are made with a silver insert inside the brass ring you speak of. I am not home right now but am positive I can help you out with your wants of the $7 strike. I am on the roard working and will not be back home until Thursday night. I can check then for you. Please shoot me an email if you can wait.
Regards, Dennis
dsdt@netptc.net