Silver Fade stem ware set. Dorothy Thorpe or other?

Hello, These Glasses were my parents, we lived in Utah and always involved and Entertaining with Utah State University. I met amazing people and lived avery cultured life. This Item was a gift from a woman who told mom it was a reverse Fade sterling silver stemware and caraf set with rack. Very nice and I don't thin they ever used it. I have it and have ot used it either. It was 1973 when I was given the set as a gift when I moved out. I read about Dorothy thompson and other glass Co. that designed the Silver band and Silver Fade. there are no marks or stickers on these. does anyone have an Idea as to what they might be and the year? I am so greatful for anyones help. I want to pass on this set to my daighter and it would be nice to have Info. to go with it. Thanks so much.