Unfortunately, I can tell you categorically that this is a fake. The marks are in imitation of Puiforcat & the French export marks, but they are spurious. This is at least the third time I have seen one of these. There is also a very similar model of tankard floating around that is more Renaissance in style rather than Romantic, with male warrior figures, but it is certainly of the same origin and it, too, has the same fake Puiforcat marks - though sometimes you see it with fake Russian or German marks!
Both tankards have been popping up regularly at auction houses for the last few years. I believe they are actually silver, not plate, and the work is competent, though not stellar. (I mean, look at the figure of Diana on the finial - she's muddy and ill-proportioned and downright goofy-looking: hardly the work of a maker of Puiforcat's skill.)
Trust me: I work in an auction house and this and the other tankard I mention are notorious in the industry. They are absolutely of recent manufacture.
Sorry to be the bearer of bad news . . .