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Thanks for the reply. I saw that picture of the C.S. initials on the unitdentified mark site, but this is just a little bit different, so I thought maybe that might have meant something. Hopefully someone full of vast knowledge will see my post someday & be able to answer. Thanks again...I reall...

I have an 11" plate that I know nothing about. Is it silver plate or other? Below are pictures of the marks. can you help identify? Thanks!