Princesa chinese bowls

by kevin
(alabama, USA)

I have two bowls that appear to be very old can you tell me anything about them and if they are valuable.One has a handpainted crown on the bottom with Princesa (handwritten) underneath it. They other one looks as if it was stamped with the same insignia and name. They are in great condition. Any help you could offer would be greatly appreciated. What is this princesa marking? I cant find anything online. The bowls are blue and white with a redish orage rim and and ring around the bottom. Thanks