How much is a 1897 plate with UW on the back worth?

i don't know how much is worth but i had a similar problem after some research i can say uw stands for united Wilson...united Wilson porcelain factory is based in Hong Kong founded 1970's/80's and still operating,i got myself 4 "uw" items and thought 1897 would worth something.anyway gotheborg.com/marks/20thcenturychina.shtml

look on this link as a start point . hope been helpful