She found this little treasure in one of the many antique stores located in the ancient city of York. The dealer at the shop told her that it was called "Royal Derby" china and that it was from the 1820's. So, she and I did a bit of brief research on-line and came up with a few things. This site tells a little bit about the history of "Royal Crown Derby" Porcelain, and Here is a page that has a nearly exact replica of the cup I now own (look down the page at figure #8). The only difference is the shape of the handle. Mine has a cute little upward curve at the top.