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Vase model 50/I with gray blue hare skin glaze, made by Pottenbakkerij De Vier Paddenstoelen from Utrecht. In good condition, but a number of firing errors on the edge that have been glazed. The vase is not marked, but this probably has to do with the imperfections after firing.
In the book "Pottenbakkerij De Vier Padedenstoel 1920-1950" the vase is mentioned on page 182 photos 1 + 2 or 2nd right. Model number 50 came in three or four sizes and this was probably the smallest size.