I do not know of anything, but are (as are most Rootschatters) more than willing to help you research yourself to see if any connection can be found.
To do that, we need some more info - do you know when approx. the plate was inherited? And from whom? And re your grandfather - assuming he is now deceased, (if still alive do not give any details) - when and where was he born? Do you know his father's name? His mum's name and maiden name? What else do you know about his wider family?
