HI,
I think the blue and the decorations look to be from the late-qing period. I don't know about the bottom, perhaps it is a 20th century replica. What do you think?
Hi Ssbill, usually when you see a dirty bottom like this it is a fake.
The blue color is not corresponding to the era mentioned in the mark, neither is the bottom and foot rim. Six character marks in a double ring are not normally late Qing either.