The vases are 15.5cm en 38cm high and 14 en 19cm wide.

The St Lukas pottery started in Utrecht in 1909 and went bankrupt in 1923.  They specialised in high glazed items, lustrous glaze was their trademark.

In the St Lukas pottery it was all about glaze; they fired the pottery a number of times and sometimes used actual gold dust to create the maximum amount of lustre. The high cost associated with this as well as the depression after World War 1 probably led to their bankruptcy.

The vases are so reflective that it adopts the scenery around it. I cannot even hide the camera that takes the photo.

The "1" and "14" denote the model number, both have the same colour code (K) but the colour does not look the same at all.
In 1920 the following advertisement appeared here in the newspapers, It is a real possibility that these 2 vases were bought here locally.