Extremely rare dexterity puzzle

Made in Germany 

Represent a baby on its potty

Works like a hourglass

THE BABY IS ON ITS POT, WE TURN IT OVER, BABY FILLS UP AND BY TURNING IT OVER AGAIN IT EMPTIES ITSELF, THE COUNTDOWN BEGINS

Note an impact on the left side of the glass and several dents on the sheet metal part - 
outline


Diameter: 2.36 inches (6 cm)

Look at the pictures that are part of the description.

Shipping to USA cost $45
Others countries : thanks to contact me