Hi, I'm trying to identify this bottle (by glassmaker, product it held, anything!) and haven't had luck so far. As you see in the photos, it's clear and rectangular with eight circular indents on each side. There are two seams on the short sides that go all the way up through the rim. The only markings on the bottom are "PP" in the center and what is either a #9
or just a circle below that. I haven't been able to track down what maker or brand the "PP" might stand for. Any help would be much appreciated.