Hi, your piece is part of a set, Ming and Toy. If you check ebay these pieces come up now and then. Value depends on color and condition.
If you wish to "locate" Toy, your best bet is to look in one of the Florence Ceramics collector guides. They are also for sale on ebay. You can sometimes find them at antique malls too-- the ones that sell reference books.
Hope this helps.
Marion in Pasadena
Florence Ceramics Collectors Society