Coke Pass by Jack Chanin

This is a very well-made vintage prop! You show two glass Cola bottles...one is half full, one is empty. They are placed into two tubes, and the tops of the bottles never leave the audience's sight. With a magic pass, the liquid from one bottle magically travels to the other bottle!

This looks very magical, and doesn't use the typical double-walled gimmicks. Very clever. Complete with original instructions.