Scent bottle joke

We have two examples. When the stopper is removed to smell the scent, the liquid dribbles out from the bottom of the bottle. There is a small hole in the bottom of the bottle. On filling the bottle with water it is necessary to hold a finger over the hole. When the stopper is put in place, the water is held in automatically, only to be released when the stopper is removed. Great fun. The tag around the stopper with the number 2350 is the identification number of the sample provided by the unknown supplier. The advertisement is from a Davenports catalogue.