In order for me to properly assess what you have I will need to see images and clear, in-focus close-ups of the mark
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The mark on your Delft vase is for Oud Delft (Old Delft) which was founded by Roelof Elshout in 1920 in Nijmegen and active until 1995 when they were bought by Delftsche Huys.
Delft is a Dutch city and also a type of pottery from Holland. It is technically tin glazed earthenware, the majority being white with blue handpainted underglaze decoration. In England and Italy glazed earthenware is called majolica and in France it is called faience.
Here is a link for you to a comparable Oud Delft vase #180 that sold for $400:
Expect to garner around the same amount for your vase as well.
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