I bought it in a charity shop today just because it's so beautiful, and I've googled it but can't find it. I can find a 1970's reproduction with much washier blue and a different border, and also lacking the artist signature and date on the front. Ours is quite large, has a straight edge, is signed Otto Eerelman 1839 and has the Delft pottery mark on the back, the date again, that it's handpainted and a triangle. Can anyone tell me anything more about it please?