A moment of your time

I always try to share the knowledge and tidbits that come into my life with my readers, believing that is part of the reason I have the information in the first place. Today I am asking for a moment of your time to help me identify 3 pieces of very heavy glass serving dishes that have been in my possession for many years. I have been told by a couple of people that they are perhaps from around 1920-1930 and possibly are Pfaltzgraff ware. I have found no marking on any of the pieces.

fish platter measures 11"x15"

divided serving platter measures 12"x11"

shell bowl measures 11"

Please comment if you have information on the vintage or value of these pieces. Thank you for this moment of your time.