I'm sure you have. If you are anything like me those times are few and far between. I have been taking such a beating on ebay with other more seasoned and experienced button collectors, it must have just been my time to get an awesome listing!
I think they are mid century 50's vintage. Here's what the listing said.
"This is a huge lot of mixed vintage buttons ~ these seem to be mostly made of plastic or composite; some have rhinestones or Mother-of-Pearl ~ a very nice "grab bag" for a crafter."
Very nice grab bag indeed! This was just 4 handfuls of what I got. The assortment is just unbelievable, who knew!