I have a few pieces of "Black Prince" dishes by Jonhson Bros. Made in England. I have had no success at china internet sites. The plates are white with a black ribbon design and black tea cups. They are not "fine china" and the shape leads be to beleive they are from the 40's 0r 50's. Should I refer to these pieces as "ceramic" or "earthenware" when serching for them? i don't usually collect dishes so I could use some help.