Just thought I would do the "to the top" thing. I looked it over really well with a magnifying glass and there is no signature on it, so just a really nice unsigned piece I guess with no way to ID it, so looks like I will just be enjoying it.
I can't remember the name now, but there was a guy who taught at UW Madison in the 50s or 60s that sort of got the ball rolling for US studio art glass (name escapes me right now) and this was in my mom's house in Middleton WI, which is a west side suburb of Madison, don't know if there is any possible connection there or not, but thought it was worth mentioning.