A shaker or a juice jar?

I was watching The High Low Project on HGTV. I think the episode was from the 2nd season, and it was a 60s inspired living room.

They did a bar set for them on the cheap and she gave them this:

I saw it on the show and ran back to the thrift store to get the one I saw there yesterday. Good thing it was still there. (yes, I do still have my air conditioner in the window.)

This is the inside of the 'cocktail shaker'

Um, isn't it a juice jar? I'll do some research, but I left it at the store originally because I thought it was just a recycled jar. A fancy juice jar, but still a juice jar. It was $.50, I'll find out.