Delft Porcelain Vase with Top

Delft porcelain or ceramic vase and separate top piece. Front of vase displays blue glaze designs of a ship (left) and a windmill (right). Back vase displays blue glaze design of fern-like leafs. Each side of vase displays blue glaze floral designs. Bottom marking in blue glaze reads: "n/Delft dec 511" - left of this marking is a capital letter "D" imprinted into the ceramic. The top piece handle appears to have been broken and glued back together. The top  of the vase has a minor crack measuring 2".