Buzzer with Antique Capacitor

This circuit uses a momentary push button, a buzzer, and a capacitor. I got this antique capacitor from an estate sale. It is over twice the size of a modern one of the same capacity and voltage. (400 μF at 25 Volts). A similar size modern capacitor has about 12 times the capacity at the same voltage.
This is one of my projects that has been shown at the Austin and Floresville Maker Faires. I plan to show it at the San Antonio Maker Faire soon. This is a favorite among kids, who like to push the button repetitively.  The capacitor stores power and slowly releases it. This gives the buzzer an interesting sound. Dad describes as annoying and Mom says it sounds like a cartoon spring "boing".