Hello, Although this piece does resemble the PK shape, the difference in them is that the foot of the PK is generally different. It is difficult to see unless you have good images of a PK from the right angle. The reason that it is described as having a metal covered foot is because there is actually a raised "foot" or base molded into the bottom of the form. I have attached a couple of images which should show the raised foot. The color and style of the glass used on this piece do not strike me as PK.
I agree with Mike M on this one. The final image shows a pair of pieces by Kralik. The shape is pretty much the same. The white veining used on the pair is a marker for Kralik production.