I lucked into about 9 or 10 of these old chick fountains. Can someone tell me approx what year these were popular? They came from an old barn that had lots of other jars from the 1970s in it so I am thinking approx from the 1970s? What do you all think? Most say Cool Water Fountain on the bottom, but one says National Ideal Premier Chick Fount. I will use them with my babies, though I doubt I will need 10 of them!