These appear to have been made by different companies. Westmoreland Glass Company in the USA being one company who made them. Portieux in France too I think? They were originally used to place calling cards on. Sometimes called 'Pauper's hands'. They have been discussed here in the past, but I'm unable to locate the posting. I'm sure someone more knowledgeable will be able to give you more info. More recently, Avon ones have appeared.