Large antique crystal glass set, cut snowflake pattern

I have a large set of what I believe to be antique crystal glasses (over 40). The pattern is a very delicate, cut and etched snowflake or starburst design. There are no other markings on the glasses. I would love some help identifying their maker, pattern and age. And are they actually crystal...how can I tell? They ring beautifully when thumped on the rims. Let me know if these photos aren't enough to go by and I will upload more.