Hi, If I could see a picture of your set I would be able to help more. If made in USA, company that comes to mind is Cambridge, Fostoria, Heisey< Tiffin. They are the most common. The only way to know who made them & value is to see the pattern & stems. If you have a difficult time in posting a picture, look on E-bay or google images. All of these companies made beautiful crystal, so thin & delicate that they are hard to find without little dings & knicks.All have pattern flowers on them or plain also.