I'm not sure how this bottle passed quality control, it has a couple major flaws. It appears to have fallen over while the glass in the base was still soft. There is a rather large bulge on the backside near the base and it lays flat without wobbling. The glass around the lip has been ground but...
This is a small selection of bottles my brother and I have dug up near my house over the past few months. We've excavated well over one hundred bottles so far and there's plenty more to go. As far as we can tell the dump goes from the early 1900's up into the 40's or 50's.