The stamp in the square is 光緒年製 "Made under the reign of Guangxu Emperor." This doesn't always mean the porcelain really made in that era. This mark became a symbol of high-quality, so it's used also in Japan.
Another stamp looks like 正銀. I don't know if it refers to the artist's name or something. (正銀 usually refers to silver coins.)
Here is something similar. No guarantees that this one (or yours) is authentic. Yours looks authentic, but this kind of antique is out of my area of study.