I found this dress in the costume section of a local thrift store. I bought it because it has every feature I usually see in a 50s dress except the zipper. All the seams are pinked. There is interfacing in the collar area. The chest has darts. It’s extremely well made. The material is the same satin-like fabric in a 50s skirt I have, and it also shares an exact same red tulle underneath. The zipper is nylon and says “Benton” on the metal tab. I wonder if it is a very well made 50s costume dress made in the 60s or 70s, or if it’s genuine 50s but the zipper was replaced. I do think it was professionally made but there isn’t a sign of a tag anywhere. Thanks for your help!