Just a follow up...I emailed William Pitt of Brookside Antiques, and he said, "Yes, I believe your vase to be made by Mt. Washington. Although different companies made satin glass, this is a shape that is typical of Mt. Washington." I tend to think he's a pretty good source. The only book I have with this kind of glass in it...It seems like half the photos are his! Also, I believe this would be dotted swiss pattern rather than muslin. The pattern on my vase is more like dotted swiss fabric.