Coffee Birds

I thought it would be fun to post on a few of my favorite things. Pretty, old (I guess the hip word is "vintage") nostalgic things are inspiring to me and perhaps fun for someone else to see or remember.
These are my Coffee Birds. My grandmother had a set of these (there are 6) when I was a kid and I remember my sister and I drinking chocolate milk from them. We really loved the cups. According to my mom, my sister and I christened them "coffee birds" (since we saw my grandmother drink her coffee from them) and would ask for them as such for our beverages.
I don't know what happened to her set after junior high or so, but somehow they were out of sight for several years. (Actually, I think they flew away during a move to a different house).
Then, my husband and I happened upon some at an antique store in Wisconsin and I had to have them! They were very cheap; I'm sure they're not worth much at all. I've seen a few more in shops since then and always have a hard time passing them up.
I would be interested to know when they were made and where they came from, but not enough so that I've bothered to research it. They were probably a "dime store" find or something equally insignificant, but nostalgia is great for making something seem really valuable.
I love my coffee birds!