This is described by Tom Haunton in his Last Links to the Past - 20th Century South Jersey Glass book as a "Sunflower Pinch Bottle" (incidentally, I cannot recommend this book enough - it is a great resource)
He says the mold was used by Clevenger from the 1960s to 90s but may have been the same mold used previously by another company (or similar)
You may see the letters "CB" on the base
Chris