Found Collection

I do not know any information about this china, even if it is an antique.
It has the logo "CPO" word in a gold diamond symbol. The cups are eggshell
china but the plates are heavier.
The symbol is something like this:

                 *
             *      *
          *     CPO    *
             *      *
                 *

I appreciate any response, even if is to let me know is common stuff.

Thank you, Nancy.