Had I not known the maker of this I would have felt that Danny Dew made this as a Paul Fox item. It is 3 3/8" in diameter with a height of 3 3/4" in nickeled Brass.
The magician borrows a hat (yes you can do this with a Baseball hat) and cracks an egg into the cup followed by stirring it with a spoon. The contents are poured into the hat (funny for the audience not so funny for the owner) all is made good as when the hat is returned it is clean with no trace of an egg at all!
This is so well made and the fact that the removable section nests under the shoulder ring of the cup is well thought out. A couple of tiny dings otherwise fine condition.