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The design is too sweet & romanticised to be authentically Renaissance, I think, and this is borne out by the marks. The top mark - a cursive "V" (on its side in the photo) - is the import duty mark used in the Netherlands 1906-1953. The other two marks - "13" and "N" - are Hanau pseudo marks in...

Not 18th century but 19th, and not Frankfurt but Heilbronn. The Frankfurt eagle generally had the “13” within the mark, not in a separate punch, whereas the Heilbronn eagle was frequently struck incuse, as it is here. And, to my eye, the style of your teapot is very much third quarter 19th century. ...

Definitely Berlin. The letter in the Berlin bear mark was introduced around 1745 and changed with the election of a new guild chief, who served, apparently, an indefinite term. The “K” in your mark was for guild chief/primary assayer J. C. S. Kessner, who served from 19 Jan 1819 to 4 Sep 1854. Unles...