Because the finial is flat on the bottom, I wonder whether it may have been adapted from former usage as a knob on a lid for a teapot or other such container. Notice the difference in the color of the enamel and the patina of the metal; these differences are testimony to "age".

Highlander, you have used the words: "Antique, vintage and new." I would like to know the dates you are using for these words.