An early Hydrostatic Coke Bottle.
This is an early coke bottle modified so you can perform the Hydrostatic liquid effect. The bottle is filled with water and when tipped over, water naturally flows out. But on your command the water stops flowing. You can then push match sticks or tooth picks up through the upside-down bottle and water still does no come out. Then on your command the water flows.
Condition: very good.
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